After a short but intense preparation of the artillery, the attack was launched at 6.05pm. To lead the assault, General Gaucher commander of the 164^th division chose the 3^rd battalion of the 152^nd Regiment, Moréteaux’s Battalion from the 334^th I.R and from many other corps francs (name of one of the French army’s corps) coming from various unities , in particular the 41^st Battalion de chasseurs à pied. The troops of assault were preceded by soldiers equipped with flamethrowers to destroy the German posts of resistance. In total, more than 2,000 men participated to this assault.

At 9 pm, in spite of 2 German counter-attacks, the Cave of the Dragoon was taken! The French captured more than 300 prisoners (304 or 327, from sources to sources) and half of them inside of the Cave in circumstances that have never really been cleared up in regards to the role the 152^nd and the 334I.R did play. In total, the French lost 329 men: 79 dead, 238 injured and 12 disappeared. The German losses are unknown.

The capture of the Cave of the Dragoon didn’t change the process of the war. This operation had a limited objective and was in accordance to General Pétain’s new strategy. The “ Battle of the observatories” had to continue on the Chemin des Dames until July. That’s how on 26^th July, during an attack, the German managed to recover the northern part of the Cave of the Dragoon. The Cave would have remained entirely French for only one month.  

But, with a so large number of prisoners, as well as a so mysterious name: “Cave of the Dragoon”, the 25^th June’s attack knew unprecedented media coverage.  Special correspondents from Parisian newspapers were invited to Beaurieux by the High Commander to interview prisoners and troops that participated to the attack. The capture of the Cave of the Dragoon made the main headlines in all French newspapers and also brought a new glory to the 15^th I.R. On 10^th July, the Regiment obtained its 4^th mention: a fourragère (ornament) with the colours of the French army. A detachment with the new flag of the 15/2 was invited to participate to the 14^th July parade in Paris . In 1936, General Gaucher published the historical account of the 164^th Infantry Division untitled La Division du Dragon (The Dragoon Division).