In order to parry, as might be the case, to a more accurate enemy counter-battery, the railway battalion built or layed out sucessively several sites for heavy artillery firing. It is so, that two sites on the switch point of Eggewaertscappelle, a third at the station of Moerhoek and a fourth on the point of Isenberghe, served as reserve, and were occupied in turns. The Leugenboom heavy gun entered in action the 27^{th} of June 1917. Between 5 and 10 o’clock, it bombarded Malo-on-sea and Dunkirk. This first action made numerous victims. The shells were of 380 mm. One shell, amongst others, the first, it is thought, fell on the Casino of Malo, where the general staff of the XV^{th} British army corps was established: it made twenty four victims, eleven dead and thirteen wounded. In July 1917, there were several bombardments to be noted on different objectives: Furnes, Dunkirk, Coxyde, Forthem and Alveringhem. The bombardments of Dunkirk, threatening to become very frequent, alarmed the authorities, and it was decided from the 19^{th} of July 1917 to create two direct telephone lines at different courses which would join Dunkirk to the Pervyse railway station observation-post, which was particularly well situated. The starting shots of Leugenboom, heard at the railway station at Pervyse, were in that way instantly communicated to Dunkirk, where the reception posts gave the alert to the town by powerful horns and other alarm engines, thus permitting the population to take refuge in the concrete shelters specially built for that purpose. In spite of the well studied counter-battery, the Leugenboom gun still continued firing. The lulls, which lasted often long time, gave the hope that a positive result had been obtained. Then after a lapse of one and sometimes two months, the rage of the Germans revived and Dunkirk was again subjected to further attacks. In 1918, bombardments were very frequent. At certain times, they became even daily, but Dunkirk was not always the objective. In May and notably in June, the firing of Leugenboom was directed on Klein-Leysele and the 27^{th} of September 1918 on Bergues. The offensive of Flanders, at last lights up. But the enraged Germans will hold on till the last minute. It is only on the 16^{th} of October at 20 minutes to three that the heavy cannon of Leugenboom is for ever silenced. In its last spasms of agony it dealt terrible blows to the localities situated behind the front of attack.