25 May 1940. Gravelines. France.
The arrival of the convoy from Calais with rations the previous day had emphasised the proximity of the German forces. The surviving tanks had taken up positions to offer the French troops some close support. When the column of captured German vehicles arrived from St Omer, Brigadier Vyvyan Pope took one look at them, then saw the three Valiants, which nearly gave him a heart attack, and ordered them all straight to the port and on the first ship available back to England. They had departed, along with the German POWs after dark the night before.
The 48th Division, less 143rd Brigade, arrived in the morning of 25 May to take up positions along the canal line. The French commander of 68e Division d’Infanterie at Dunkirk was reasonably happy with his current dispositions. Pope, as the senior British officer in the area, reported to General Thorne about the gap that had appeared between Calais and Gravelines. It was obvious that Calais was still an important source of supply, the rations convoy had proven that. Word was coming in from Calais that the German panzers had been encountered on the approaches to Calais, which would mean that the chances were that Calais would be lost as a port.
Thorne and Pope looked over the maps with Brigadier James Hamilton, commander of 144th Infantry Brigade, whose three Battalions would be the main force used in any action. Thorne had ordered 145th Brigade to fortify Hazebrouck and Cassel in case the Germans managed to get across the canal. What wasn’t clear was whether creating a corridor between Dunkirk and Calais was going to be possible, or whether it be throwing good money after bad. Both Thorne and Pope agreed that while a local counterattack was a good idea, holding open a corridor some ten miles long would too much for the troops currently available. Hamilton wondered if the Canal between Calais and St Omer might provide a good barrier to extend the current Canal Line from Watten. The frontage would be some 18 miles, well beyond the capacity of the current forces to contemplate. Thorne went off to try to get in touch Lord Gort at Advanced HQ to update him on the current situation.
NB text in italic differs from OTL. For those who want an extended perimeter to include Calais as well as Dunkirk, looking at the available forces (1 Brigade) and the size of the area needed to achieve this, against the opposition (8th Panzer + 1st Panzers arriving at Calais) I would have to say that I don't think it is possible.