 Arundel reached with his troops in early May 1435 at Gournay and marched without special backup on Gerberoy, he believed only weakly defended.His troops (according to Jean Pillet about 3,000 men, but this figure is probably only a rough estimate) were certainly numerically far superior to the French troops.The Earl of Arundel appeared on May 9th before Gerberoy along with a vanguard that probably consisted of a few knights and withdrew after a brief observation of the valley, waiting for the arrival of the main English force.