The vessels themselves had a significant amount of variation in design. Uniremes (or if you prefer monoremes), biremes and triremes featured single, double or triple deck arrangements of oars on each side. Quadremes, Quinqueremes and Hexeremes retained the triple configuration, but added additional rowers at each oar. Galleys were not at the mercy of the wind and currents. Crews could maintain speeds of 7~8 knots all day with top speeds of 10 knots in short bursts. It was possible to operate in as little as three feet deep water and they could turn much faster than any pre-industrial era ship of equivalent size. Sails could also be unfurled for a top speed of 5~6 knots should the oarsmen need a rest. The combination of light weight and flat keel made it possible to beach a galley relatively quickly should the weather turn foul. This form of dry land storage had the added advantage of keeping the hull free of worms, rot and seaweed. Some galleys even had a lead coating below the waterline to prevent barnacles.
Rams were up to seven feet long and tipped with a bronze head with flanged sides meant to rend holes in moving targets. Even a slow collision at a mere three to four knots was capable of punching through another ship's side at oblique angels. Getting T-boned by a large vessel at full speed might very well have been a back breaking experience for both the struck ship and her crew. Even a glancing blow might be deadly in that it could potentially shear the oars off should the crew not bring them in quick enough. Thus, crippling the galley and leaving it at a severe disadvantage. Ramming became such a popular tactic that special defensive formations were devised to force an aggressor to open himself up to counter-ramming.
Experienced rowers were valued for their strength and endurance, as well as being able to keep tempo for hours on end. Generally speaking, war galleys only had about 30 inches of wiggle room between each oar so it was vital to maintain the rhythm of each stroke. One advantage of having two or even three rowers per oar was the fact that more senior center most oarsmen could keep their less experienced juniors in sync.
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So, with all this said what eventually brought an end to the era of war galleys. In a word - economics. Having large teams of hard working oarsmen meant also having to keep them well nourished and hydrated. This, of course, greatly limited the maximum range a galley could travel before it need to resupply. Hence, logistics were an especially big and ever present concern for navel commanders of that era. Most galleys never left sight of land even when navigation techniques improved to the point that it was no longer necessary to hug the coastline. The reason for this was the danger of sudden storms, not to mention the need for dry land so the crew could have a place to stretch out and sleep on at night. In other words the age of war galleys came to an end when the drum beat changed from "catch and drive" to "quick and cheap."
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