Cavalry brigade detected Bulgarian reinforcements arriving by rail. As a result, the Greek HQ ordered the offensive to continue the next morning. The 10th division was ordered to disengage from the enemy at Kalinovo (renamed Soultogianneika between both world wars) and send forces southward to participate in the fighting of Kilkis while the 1st and 6th divisions (at the time engaged in the direction of Lachanas) was ordered to create a 6-battalion strong detachment plus mountain artillery to reinforce the forces attacking Kilkis on the flank. Acting under the previous order of the Greek HQ which requested Kilkis be captured by the night of 20 June, the 2nd division went forward alone. During the night of 20 June, following an artillery fire exchange, two regiments of the 2nd division crossed the Gallikos River and successively attacked the 1st, 2nd and 3rd defensive lines of the Bulgarians entering the town of Kilkis by the morning of 21 June. In the morning the rest of the Greek divisions joined the attack and the Bulgarians retreated to the north. The Greeks pursued the retreating Bulgarians but lost contact with their enemy due to exhaustion. In the three days battle around Kilkis, the Greeks suffered heavy casualties totalling 5,652 killed and wounded. An additional 276 casualties were suffered by the 10th division which had captured (Gevgelija on 20 June and the hills of Kalinovo in the afternoon of 21 June. Approximately 500 Bulgarian soldiers, 3 guns and many rifles had been captured. Lachanas Similar to the defense of Kilkis, the Bulgarians also had prepared defensive works at Lachanas. Like Kilkis, the hills at Lachanas provided the Bulgarians with excellent fields of fire. On 19 June, the Greek 6th division advance from Assiros (Yuvesna) toward Lachanas and succeeded in capturing the Dichalo-Klepe line after losing some 530 men. The 1st division advanced from the south and successfully captured Vertiskos. On 20 June, the two Greek divisions advanced further and joined their flanks while they made contact with the main Bulgarian defensive location of Lachanas despite the fire from the Bulgarian artillery. During the night of 20 June, the order from HQ to create a detachment to hold the forces attacking Kilkis arrived. In the morning of 21 June, the Bulgarians concentrated their artillery fire on the Greek 5th regiment. Observing the 3rd battalion withdrawing to participate in the detachment for Kilkis, the Bulgarians saw an