In late August 1939, the imminence of the German attack is hardly in doubt any longer for the Polish command. For an army to be ready to fight, it must be mobilised in time: recalling reservists, moving up units, arming the positions. Every day of delay is paid for in lives and in ground.
But Warsaw is under strong pressure from its allies. France and the United Kingdom, which are pursuing final diplomatic démarches, fear that a visible Polish general mobilisation might be interpreted as a provocation and furnish with a pretext. They press Poland to play for time.
Marshal and the government face an agonising choice. Decree general mobilisation without delay, in the name of the military imperative, even at the cost of crossing the allies? Defer under Franco-British pressure, to preserve the chances of diplomacy, at the risk of falling behind? Or order a partial and discreet mobilisation, a lame compromise between the 2? Each hour lost or gained in this race against the clock could be measured, when the moment comes, in territories and in lives.
Warsaw, 29 August 1939, in command of the Polish army: should mobilisation go ahead despite Allied pressure to wait?
Poland suffers the worst of both worlds: having begun general mobilisation on 29-30 August, it briefly suspends it at the urgent request of France and the United Kingdom, before resuming it on 31 August. This setback, imposed by Allied diplomacy, disorganises the timetable and loses precious hours just as the German army prepares to strike. When the attack comes on 1 September, part of the Polish units have not completed their deployment. The thwarted mobilisation of late August illustrates the tension between military logic and diplomatic calculations — here to Poland's detriment.
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