well it obviously was an elite unit, so it had high accuracy and reload time. and since it can hide anywhere and even remain hidden while firing it could take out every unit without being shot back at. and every volly took out about 100 men that is 1/4 bullets hitting, in itself not so high, but since it takes only seconds to reload u can take out a unit within a minute. and i mean completely annihilate it to the last man. cannons are totally awesome, but i think the battery size needs to be limited and they need to be alot more expensive, because now u can just pick all cannons and 2 infantry and u can rip appart any army unless it has better and bigger cannon. so the need for infantry is obsolete. and i know that cannons were so lethal but infantry was still needed. and they never carried that many guns to the battle. so i'd say ok howitzers can go for 12 per battery, but no more than 2 batteries can be fielded. and fieldguns go around 2 or 4 per battery but are highly mobile and such. i think 400 men per unit is very nice. this means u can get 6000 men on a battlefield easy and this awesome.
cavalry is not entirely useless, but i cant charge infantry anymore, atleast not head on. it might do some flanking. but it is best used to rout cannon when the battle is almost over. i did one charge across the map when i had routed the enemy infantry and i still lost like 100 men out of my 200. it was like the charge of the light brigade :P
the mod is working on a campaign map with ww1 diplomacy and starting positions, so thats what im waiting for. they even have previews of ww1 cannon and even machine gun, a vicker. totally awesome!
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