The Kościuszko Squadron was first used in the Kiev Offensive in April 1920, rebasing from Lwów to Połonne. Its aircraft were Albatros D.III (Oef) fighters, supplemented by Ansaldo A.1 Balilla. Since there were no air encounters, primary missions became reconnaissance and ground attack. Most of the Squadron's flights were directed against Semyon Budionny's First Cavalry Army. The Squadron developed a tactic of low-altitude machine-gun strafing runs. Polish land commanders highly valued the contribution of the Kościuszko Squadron. General Puchucki of the 13th Infantry Division wrote in a report: "The American pilots, though exhausted, fight tenaciously. During the last offensive, their commander attacked enemy formations from the rear, raining machine-gun bullets down on their heads. Without the American pilots' help, we would long ago have been done for."