Seems the catapult munition cannot be changed as on the c64 version. Never realized that you loose all men if one of your castles gets captured. Maybe a bug or emulation error.. whatsoever.
From Wikipedia:
Defender of the Crown is a strategy computer game designed by Kellyn Beck. It was Cinemaware's first game, and was originally released for the Commodore Amiga in 1986, setting a new standard for graphic quality in home computer games.
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