 After that, the supreme military commander Prince Aleksey Trubetskoy decided to finish off the small 4,000 garrison of Konotop Castle held by Cossacks of Hulyanytsky before proceeding in his pursuit of Vyhovsky.Prince Trubetskoy's hopes for a quick resolution of the Konotop stand-off were dimmed when Hulyanytsky and his Cossacks refused to betray hetman Vyhovsky and mounted a fierce and protracted defence of Konotop with only 4,000 Cossacks.According to a historian Markevych, on 21 April 1659, after a morning prayer, Trubetskoy ordered an all-out assault on the fortress's fortifications.