wiki commons, 5th century relief of an Athenian trireme with unprotected rowers |
wind independent propulsion - paddles and oars
In an environment of sailing ships, paddles and oars offered the opportunity to translate numbers of humans on a watercraft into motive power. This motive power allows for approaches that can not be made under sail and was a usual procedure for maneuvering into harbour for all kinds of ships. The approach vectors allowed for beaching to trade or raid on many beaches of the Mediterranean with ships, the penteconter for example, that had not yet split into war and merchant ships. The threat of raids from the sea explains the location of a number of Greek poleis away from the sea. Athens is one such example that needed several kilometers/miles of long walls to connect their city with one of their harbours (there were several more harbours available). A ship that carries more men than goods has usually less peaceful intentions and is more likely to catch under oars a ship with more goods and less men. Piracy in the Mediterranean used suitable known ambush positions that offered favourable conditions of wind and visibility for approaching and boarding.
armed men on the ships - marines
Boarding was the essence of naval power expression that allowed to seize ship with goods and surviving crews. The ability to successfully board was dependent on the training and numbers of marines in comparison to defenders in close quarters combat.
Missiles were not yet capable to destroy other ships, but thin the ranks of defenders and rowers of naval vessels. Bows, javelins and early crossbows (gastraphetes and oxybeles) or ballistae had different ranges, penetration power and rate of shot. Positioning for shots was possible and does make a major difference in missile warfare, because human capability to defend against all these visible (slow and deflectable in comparison to modern gunpowder weapons) missiles was much better than against surprise missiles from unseen angles.
Boarding marines had an advantage from supporting missile platforms and boarding could be conducted from several angles by teaming up on ships, all kinds of flanking maneuvers. Add to this temporary or permanent mobility gains made via breaking oars and masts or ripping sails, with the skillful use of hooks and claws or flooded hulls after ramming damage and you have a way of fighting with increasing inequality. Weaponizing the ship gave one side more options at putting the other at a disadvantage.
wiki commons, Assyrian representation of a direme warship in 700 BC with an elevated platform for marines |
a ram suitable for damaging ships
The damage did not make ships sink to the bottom of the sea, but foremost increased displacement to the level of immobility. Ships were full with humans, tools and wood, who could provide a number of stop gap measures against the kind of damage incurred by a naval ram. Impressive as it may look, it could not punch a hole, but only break materials with resulting cracks for water to enter. planks were quite thick and joined by mortise and tenon.
Ideas for speedier standard design production did exist, with ships built around design templates for the interior in the usual way with outer hull first. After finishing the outer construction, the templates were removed and interior could be fitted to the result. The weight of a heavily manned ramming vessel with low dead weight and sleek lines for speed posed a major stability problem due to hogging. That was solved with cables running from stern to bow. Like in modern ships, structural failures could lead to a ship breaking apart under its own weight. As for the naval ram, with an understanding of ship construction and handling critical damage could be delivered that compromised stability to the degree of collapse of the hull, but not with one limited blow. Sea battles between such fleets usually take note of the degree of mutually delivered damage to ships without sinking each other.
Not only hulls were damaged, but oars, rudders and sails as well. The oars could be broken by the sheer momentum of passing hulls, while rudders were a prime targets for grappling with small maneuverable vessels usually employed in defensive encounters. Sails time and again fall prey to missiles that create holes in them.
Pirates used to chase sailing ships with their oared ships having a limited sprint time under oars to close within the range of sight of a sailing transport vessel. Longest ranged missiles suitable against the sail propulsion were of great benefit for the chances of success at capturing these sailing vessels and their content. In numbers and ship height the merchantmen were not yet capable of withstanding such attacks. The large and sophisticated merchantmen of later ages, who could beat off the timeless pirate threat, were not capable of beaching everywhere and could thus only use few suitable harbours with a network of smaller vessels always providing the regional connections from these centers. As of this age, the merchantmen were severely undermanned and had little hope to prevail in close combat.
development history
The development was from the penteconter, as a multi tool for voyages that were trade and raid in foreign lands, beyond own legal regulations with a corresponding multi-purpose crew of warrior, rower and seaman as the job description for every participant. The penteconter remained a trade vessel, but was eclipsed both in war and trade by different designs. For trade more specialized round ships developed that approached the mathematical ideal of a sphere that had most content in comparison to least surface. Hydrodynamics were not optimal for speed that was about five knots with and two knots against the wind, using square rigged sails. In warfare the penteconter received more rowers and a second deck level that elevated the warriors. You could not board a ship with a towering deck full of warriors from below. This gave the new type of penteconter a decisive advantage that enabled them to focus on rowing and damaging other ships. The top level rowers were still warriors. Against a foe in low decked ships they could rather use their superior rowing power to create damage to his ships and use the results in timing to pick the fights of their attacking marines. Picking fights leads to increased success, while a higher position enables fewer men to fend off more.
The milestone in this development of successful ship to ship engagements was the trireme that could smash into the hulls of enemy ships on a degree not possible with the older biremes. For this purpose another level of rowers was added, either slightly elevated from the second level, as in Phoenician designs, or next to the second level with an outrigger, as in Greek designs. Both increasingly aimed at damage of ships and fought more defensive in boarding action with Athens taking the lead in this direction by a massive build-up of very light rowing ships with a small select force of hoplites (The strategos Cimon probably temporarily reverted that Athenian trend). Other navies were more convinced of strong hulls with more marines that maintained ramming as a tactic, but boarding as the decisive element that could be conducted with an enemy not as crippled by ship damage as Athenian marines needed for such a success. Ramming could be used to inflict damage beyond the structural limits of ships that would make them break and submerge as floating wood.
humans on board
Fighting for one or the other advantage was tiring for rowers and marines, while chasing another ship or fleet tired the pursuer a lot. The pursuer needed a speed advantage that required an more than square energy input increase. Rowing all night to the naval Battle of Salamis in order to catch the allied Greek fleet in the Persian War was criticized as a folly by the Phoenician nobles (who lost their heads for insubordination after the battle was lost). These tolls on each crew made warfare of rowed ships one of the few examples of naval warfare suitable for the use of fresh reserves that could turn the tables.
Manning as well didn't require exact fulfillment of certain figures and likely was understrength with some overmanning by compensating rowers. These rowers increasingly served in a non-close combat role, but should not discounted as light infantry with shields, javelins, clubs and knives. As for close quarters against heavily armed marines they were no match, allowing to board and conquer enemy ships, although on land they could wreak havoc on unexpected and unarmed people. Warfare with these oared ships should be seen in an economic context of enabling to extract valuables from the coasts, where most people settle and wealth is accumulated due to transport. Like each and every robbery, the get-away vehicle was a problem and a highly capable warship that only required a few heavily armed marines nicely solved this issue. As for Athens, the increasing reliance on ship on ship warfare through maneuver reduced the risk to the lives of the people involved in this kind of combat, making naval&hibious warfare a low risk high gain affair. Such a constellation likely induces to follow down that route of profits with ever increasing naval armament and emphasis on shipborne capability that paid off in the raids on land.
Not only Athens followed that route in combination with island conquests and cleruchies, but Carthage as well, although the Punic had less of these tiny islands and rather more control over low density populated lands except for their North African homeland. From a very similar population and economic base they split their conquest into land and naval at the same time with reduced risk to their population base in the naval&hibious component. That does not mean that these were outstanding rowers, but that were enticed and served them for easy gains that did not require as much previous capital to invest than conquests on land. After they made their voyage, a safe investment on land might have been envisioned that offered less profit, but lower chances of misery due to weather misfortunes.
Sea lines of communication are not only ships doing almost all global transport of tonnage/mile since millennia cheaper than land transport (by a factor of 20-25 over bodies of water like lakes and seas and a factor of 4-5 along running water such as rivers). They include the transmission of messages via underwater cables. Laying these underwater cables was one of the most important endeavours for centralized control of the late colonial empires. It created a world of information exchange, an unequal exchange of improved control and exploitation by the developed and civilized world, but nonetheless.
International Telegraph Bureau (Berne, Switzerland)
Norman B. Leventhal Map Center at the Boston Public Library
All sea lines of communication enter specific hubs, harbours. The smaller a vessel is, the more hubs it can use. this has been used for trade networking as well as warfare. Viking long ships or military hovercrafts are designs for beaching at every possible location for what is termed amphibious warfare. Trading boats, barges can beach in a lot more places than sea-going ships and use the water-earth intersection for cargo transfers. The usual transport is to installations on solid ground, harbours, and rarely to floating installations that are usually ships of war or few barge carrier ships. Size and corresponding access to a selection of harbours restrict all kinds of ships. At the same time size enables to stay at sea for longer time and thus cover longer distances at less energy requirements. A ship grows cubic in load carrying capacity while energy requirements grow approximately square and the very cheap substances burned for modern ship transport are still a very significant fraction of the total floating mass.
Such exchange advantages enhance disposable income (economic Ricardo-model) and for this reason human settlement patterns do follow choices of environmental resources and exchange capabilities for personal benefits. You'll find harbours associated with rivers from the hinterland and people traditionally settling with highest density at places with running or standing bodies of water that enable(d) mass-transport of goods on boats or ships. The land-sea intersection is the place where most humans live(d).
Aspirations of the archetypes
From a security perspective the bodies of water have been (US-)classified in a three tier system:
blue water - the open ocean without nearby land
green water - maritime body of water with nearby land that allows force projection from the land
brown water - non-salt water such as rivers and lakes with a very strong force projection from the very nearby land
anti-access/area-denial (a2/ad) is the attempt to keep out unwanted visitors. It’s nowadays most often discussed as hostile measures and threats directed against the US navy in green waters.
The area access area-denial approach is the next logical step in shifting from brown water (end of colonialism) to green water control as in green water runs the highest density of most important traffic, traditionally represented by an own class of coastal non-high sea ships.
Historic examples are Alfred the Great's fleet or Charlemagne's defence program, both directed by Christian monarchs against heathen Viking raids. It's discussed whether their notorious attacks were in part a response to the Frankish raids against Denmark after the bloody conquest and Christianisation of Saxony and other neighbours.
Next step to maintain the original economic trade advantages without the economic burden of administration and “civilization” were local banana republics with differing degrees of independence.
The German High Sea Fleet (of rather coastal hull design) is an example of a politically charged "green water" navy meant to be blue. It not only served military, but more important political purposes of self-perception within the concert of European powers. The naming and design highlight the delusional character of these ambitions.
China’s green water navy's defeats triggered a long 19th/20th century with most profound impact. It even did away with the Son of Heaven, for millennia the pillar of Chinese states. While losing her many battles during these times, China was no way unaware or unable to acquire Western military technology. It's not the weapon, but the human that makes the difference and that human operates within an organization as part of a society. Nowadays, improving green water control against three of the most powerful navies of the world in direct proximity, the US navy, the Japanese navy and Republic of Korea navy is a dead sure giveaway for world domination dreams and can no way be sold as national security measures to their populace (any irony?).
US-today
Currently, there's only one un-opposable power with a very significant capability for global control of blue water sea lines of communication via large and small carriers - the US navy. They do have giant aircraft carriers and double that with amphibious warfare ships that can serve in a sea control role. None so far claims to have found a solution that outclasses the ship fighting capabilities of these large super carriers with their manned fixed wing fighter bombers. In summary there's none capable of challenging US aspirations of blue water control anywhere on the globe. Global traffic can hardly avoid not using blue water shipping lines. While the capability to interdict each and every use of the sea is impossible, the pirates of the African coast highlight that, shipping through openly hostile waters with well-armed interdicting navy force drive up the prices to hardly affordable levels. Iran's games around the Strait of Hormuz pale in comparison.
This known capability at exchange control can be applied without open declaration of hostilities or recognizable boots on the ground. Constant network-manipulation, due to sea power and lesser capabilities for uncheckable impact on the core (sea) lines of communication is the essence of naval power exercise. If your game is network manipulation it's most logical to enhance this standing by synergetic cross-effects with other fields like critical resource access and financial networks. Altogether it creates a cluster with highest profits from all human exchanges and a corresponding disposable income that can be invested into the assets for that status.
Concerning the green water, this dominant blue water power also has significant assets to make an imprint in the highest traffic density environment. The usual modern combination for amphibious warfare, not expecting to be provided harbour access by the inhabitants of a region under attack, is a large long endurance vessel (LDP, LHA, LHD and some LST) with much smaller boats (hovercrafts and catamarans) or aircrafts (helicopters and tilt rotors) for landing at as many spots as possible and thus remain unpredictable raiders (the essence of amphibious warfare since ancient times). Because people live near the places they work and most people on earth live and work near the sea shore, this is the place where destruction can be wrought by these raids and always has been. Constant destruction does have economic long-term impacts and destabilizes any opponent with a higher degree of willingness for confrontation by the leadership than by the suffering population. If highest traffic density regions are not safe, the resulting exclusion from exchange network benefits provides one sided economic advantage that expensive attempts at autarky can hardly compensate.