I switch archers with melee troops at the walls when the enemy is about halfway up the wall. So far all sieges have been absolute massacres.
Bowfire bonus/cover from walls is significant, to the point where 1 of your achers can trade fire with 3 of theirs to more or less a stalemate. Melee bonus seems even more powerful.
Two Bow Ashigaru and a General make for a very effective garrison, when combined with the free troops from the larger castles. Had absolutely no trouble defending against vastly superior enemy stacks. I might get worried though if there were a few units of mangonels in the attacking army, havent encountered them in sieges yet.
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