How did the feelings of the people in russia in 1917 the february revolution to succeed?

Burden of world war for russian people was extremly heavy and since 1915 onward russia was losing on the front with enormous casulties and cost of food in some caes even tripled despite of thta ruling czarist establishment behaved like nothing happened, unrest and angry on establishment led to situation that russians supported the revolutionists and creation of contemporary government