From 1917: War, Peace, and Revolution, by David Stevenson (OUP Oxford, 2017), Kindle pp. 98-99:
The war’s economic effects had caused the food supply crisis. Its impact on the army lay behind the mutiny. Although Russia had boosted military spending between 1909 and 1914, during the previous decade spending had stagnated. The 1914 army in some ways resembled the British rather than the French or German as, although composed of conscripts (in contrast to the British), it was relatively small and well equipped. The reverse of the coin was that barely a third of each age cohort had done service, so when casualties proved far higher than expected Russia ran out of trained men. Despite its bigger population than France or Germany, it called up similar numbers of conscripts: during the war it mobilized only 5 per cent of its population for active duty, against France’s 16 per cent and Germany’s 12 per cent. By 1917 14.6 million men had enlisted and over 5.5 million become casualties, 2.4 million of them as prisoners. At least 1 million returned to service after being wounded, and fatalities may have totalled 1.6–1.85 million. In 1914 the government sent to war the standing army and those who had served between 1904 and 1910. Subsequently it called up all the trained men of the 1896–1910 cohorts and many untrained members of the 1914–18 cohorts, but by 1916 it was recruiting men who were not only untrained but also in their forties, with jobs and families, and resistance mounted, leading in Central Asia to open revolt against being enlisted in labour corps. Even so, during the Brusilov offensive and its follow-on attacks Russian casualties may have reached another 2 million, of whom 1 million lost their lives. From the autumn the army was calling up its last reserve, including previously exempted sole breadwinners. Recruiting them led to riots in the villages and to wives mobbing induction points, and to mass protests in Petrograd.
Military censors read the soldiers’ letters, whose mood was ugly. By 1916 they betrayed deep hatred of the war and despair about winning it, condoned fraternization and mass surrender, and were desperate for a speedy peace, the Brusilov offensive exacerbating the discontent. Repeated defeats and superior enemy weaponry had dashed any early confidence, and the authorities were held to have betrayed their men. By the autumn, moreover, the army ate less and poorer-quality food. Daily bread rations were cut by a third or even two-thirds, or replaced by unpalatable lentils. Brusilov complained that on his South-Western Front the miserably inadequate provisions demoralized his troops, and between October and December over twenty mutinies broke out, including refusals to attack or to move up. Troops called out to quell a disturbance at Kremenchug refused to shoot, and the French ambassador learned to his dismay that during a strike in Petrograd soldiers had fired on the police. The authorities no longer placed their most reliable units in the cities, whose garrisons included the middle-aged and convalescents. Since 1916, moreover, strikers had been conscripted. Yet although the Petrograd commanders knew some men held revolutionary views, they had no plans to replace them.