Comment 7 for bug 1395238

it won't solve all issues. it is still possible that both players attack each others, at times different enough that their respective soldiers won't fight at the narrow point, and then soldiers of opposite sides coming back - either because wounded, or after burning down the enemy building - would find themselves stuck at the narrow point. In that case, all soldiers involved would be only trying to come back home.
But yes, that would be an extremely unlikely scenario. I doubt it's ever going to happen, both sides attacking each other at very accurate timing, so the proposed fix should work. If nothing else, it would prevent the most common scenario, that caused by a single player attacking