When the remnants of Napoleon's army crossed the Berezina River in November, only 27,000 fit soldiers survived, with 380,000 men dead or missing and 100,000 captured. Napoleon then left his men and returned to Paris to prepare the defence against the advancing Russians. The campaign effectively ended on 14 December 1812, when the last enemy troops left Russia. The Russians had lost around 210,000 men, but with their shorter supply lines, they soon replenished their armies. For every twelve soldiers of the Grande Armée that entered Russia, only two would make it out in fighting condition.