guderian's request to return 10th panzer division to his command were not granted due to the fear of allied counter-attacks in style of the battle of arras, and so xix army corps had to continue the operation with just 1st and 2nd panzer divisions on the morning of 22 may. it was thus decided to leave dunkirk for a later stage of the operation and to focus on calais with 1st panzer and on boulogne with 2nd panzer. the 2nd would advance along the coast, whereas the 1st would move towards its goal inland, along saint-omer. in their preparations, xix army corps could count on support from other units; 8th panzer division captured hesdin (initially 10th panzer's domain as per guderian's plan before 10th panzer was moved into the reserve), whereas 6th panzer division reached boisle. both 6th and 8th panzer divisions were at that point part of xli army corps. xix army corps began its operation towards calais and boulogne on 22 may. by 08:00 in the morning, the authie river had been crossed and a partial advance northwards had begun. at that point, parts of both 1st and 2nd panzer divisions still had to be held back in rearguard action at the somme river bridgeheads until they could be reinforced by xiv army corps (v. wietersheim).