Actually it depends a lot on how the gear retracts. For example, if the gear needs hydraulic pressure to keep the locking pins in place, then a hit in the hydraulic line and the resulting loss of pressure could cause such a thing. If however the landing gear depends on an electric/servo system, there would have to be a malfunction in the servos. Or maybe the manual extension system could be triggered by battle damage. In some aircraft this was a simple gravity system that just released the locking mechanism and let the gear drop into place on their own, then the pilot was advised to exert some more pressure by pulling a few positive Gs in turns to make sure the gear locked in the down position.
It's definitely a possible situation, but to know more about it and have it accurately modelled we would have to know exactly what kind of gear retraction systems were used in each aircraft type.
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