At 1700 hours on March 23, the smokescreen vanished and the entire artillery of the British 2nd Army and the American 9th Army opened fire on the enemy positions, maintaining their barrage of shells of all calibres until 0945 hours the following morning. This was, however, interspersed with pauses at times varying from sector to sector to allow the divisions launching the attack to feel out the enemy strength.
The main action devolved upon the British 2nd Army, in position north of the Lippe. On its left, XXX Corps had during the night got four battalions of the 51st Division (Major-General Thomas Rennie) across the Rhine; on its right, XII Corps had established its 15th Division (Major-General Colin Muir Barber) on the right bank of the river, opposite Xanten, while the 1st Commando Brigade went into action against the 180th Division in the ruins of Wesel. Further south, the American 9th Army, whose task was to cover the flank of the British attack, engaged its XVI Corps, whose 30th and 79th Divisions crossed the Rhine to either side of Rheinberg. According to Montgomery, German resistance was only sporadic, and certainly the two American divisions mentioned above suffered only 31 killed in the enterprise.
The offensive undertaken by the 21st Army Group was no surprise for Blasko-witz, who had even correctly estimated its main point of impact and line of advance. Accordingly-and with a degree of haste for which Kesselring reproached him-he judged it opportune to throw in his armoured reserves. The dawn saw furious counter-attacks which drew the following observation from Sir Brian Horrocks, then in command of XXX Corps:
"Reports were coming in of Germans surrendering in large numbers to the British and American forces on our flanks but there was no sign of any collapse on our front. In fact the 51st Highland Division reported that the enemy was fighting harder than at any time since Normandy. It says a lot for the morale of those German parachute and panzer troops that with chaos, disorganisation and disillusionment all around them they should still be resisting so stubbornly.”
In the course of the fighting between XXX Corps and the 15th Panzer grenadier Division, which brought into the line the paratroops from the German 6th and 7th Parachute Divisions, Major-General Rennie was killed, evidence enough of the enemy’s determination.