Pershing's soldiers first saw serious battle at Cantigny, Chateau-Thierry, Belleau Wood June 1–26, 1918, and Soissons on July 18–22, 1918. To speed up the arrival of American troops, they embarked for France leaving heavy equipment behind, and used British and French tanks, artillery, airplanes and other munitions. In September 1918 at St. Mihiel, the First Army was directly under Pershing's command; it overwhelmed the salient – the encroachment into Allied territory – that the German Army had held for three years. For the Meuse-Argonne Offensive, Pershing shifted roughly 600,000 American soldiers to the heavily defended forests of the Argonne, keeping his divisions engaged in hard fighting for 47 days, alongside the French. The Allied Hundred Days Offensive, which the Argonne fighting was part of, contributed to Germany calling for an armistice. Pershing was of the opinion that the war should continue and that all of Germany should be occupied in an effort to permanently destroy German militarism.