The Pact forces at least expected to have a working (for the time) supply chain to replenish their stocks. The 5th, even if they'd somehow pulled off a miracle, had virtually no hope of resupply. Kalisz really was a last stand situation for them - break out, or die trying.
Even the Germans at Stalingrad had some small supply behind them with the woefully inadequate air lifts - a factor which really just prolonged the inevitable.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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