I have a little info on the raid of 17/18 June 1944.

317 aircraft – 196 Lancaster’s, 90 Hali faxes, 19 Mosquitoes, 12 Stirling’s – of 1, 3, 4 and 8 Groups attacked railway targets at Aulnoye, Montdidier and St-Martin-I’ Hortier. 1 Lancaster was lost on the Montdidier raid. All targets were covered by cloud and the Master Bombers at Aulnoye and Montdidier ordered their forces to stop bombing after only 7 and 12 had bombed respectively. 87 aircraft of 4 Group bombed their target at St-martin-I’Hortier but no results were seen.

Bomber Command Diaries. Middlebrook and Everitt.

Regards
Peter.