The mutiny broke out on the evening of 30 July, earlier than the military conspirators had planned. Poor food and the withdrawal of a special allowance had, however, sparked discontent amongst the pioneers and artillerymen of the garrison, most of whom were conscripts drawn from industrial regions of Russia. The pioneer company was particularly unsettled and had been put under collective arrest by the general commanding the Sveaborg Fortress and neighboring outposts.
On 30 July, a rebellion occurred earlier than planned by military conspirators. Poor food and the removal of a special allowance had led to dissatisfaction among the pioneers and artillerymen of the garrison, many of whom were conscripts from industrial regions in Russia. The pioneer company was particularly agitated and was placed under collective arrest by the general commanding the Sveaborg Fortress and neighboring outposts.