
There are some in which you can obtain a "change of allegiance", as it were, but these are usually of the
'Medieval' or
'Renaissance' time periods, since that was common back in those times. In fact, the
SPI/S&T Series of the
"30 years War" Quad & Magazine games, even
'back-printed' the
'Artillery' in those WITH the opponents 'colors', to represent "captured" GUNS that could be turned against their
'former' owners! Back then, those were almost immobile during a
'Battle', due to their HEFT and the amount of time that it took to set up or deploy them. Even long before this during
'Ancient' times, then some "Mercs" employed could be induced to join
UP with the opponent due to current circumstances at the moment. I believe that there are even some Japanese
'Battles' during their
'Civil Wars' in which this took place as well. For "Game Designers", then they usually would cover this with an "Exclusive" Rule of which certain results could create this
'setting', depending upon the actual
'Historical' outcome. I've even seen it broached in a few
'console' Games such as the
SNES "Liberty or Death" game of the
'American Revolutionary War', where you can "bribe" an opposing
'Officer' and even
'turn' them onto your side! As for
'stragglers' and the like, then there are even some games that cover this in one form or another, such as reducing a
'Unit' gradually over time. You are able to
'recover' those as well, mostly when you sit tight or make a
'Morale' or some such "recovery roll".