During the Year 1434 the French king Charles VII increased control over the territories north of Paris, including Soissons, Compiègne, Senlis and Beauvais. Due to its position Gerberoy appeared as a good outpost to threaten the English occupied Normandy and even stronger to protect the nearby Beauvais of a possible reconquest.

The Earl of Arundel appeared on 9 May 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.

A column of French cavalry under La Hire left the town, and bypassed the position of the English vanguard to launch a surprise attack on the English, as they were marching along the road to Gournay. The French cavalry arrived undetected in a place called Les Epinettes, near Laudecourt, a hamlet near Gournay, and then attacked the English main force. After it was La Hire and his horsemen attacked the English on the streets of Gournai, and heavy fighting between the two sides ensued with many English soldiers and French cavalry being killed. When the French reinforcements appeared, the remaining English soldiers realised their situation was now hopeless and retreated to Gerberoy. During the retreat, the French were able to kill a large number of English soldiers.