The Guards were not committed to the fighting in the Falaise Pocket, but instead got a chance to rest and regroup. On the 27th they were transferred to XXX Corps under Lieutenant-General Brian Horrocks and advanced on the River Seine. Due to the near total collapse of the German Army in France they reached and crossed the river on the 29th. Here some more changes were made to the Guards organization. The use of an Armoured Reconnaissance Regiment had not proved successful, while armoured cars had prove more adept at the role, despite the disadvantage of being more tied to the road network. Consequently, the 2nd Household Cavalry were formally attached as the official division reconnaissance element. This freed up the Welsh Guards tank crews for other duties, and formal battlegroups were formed. These were far more organized than the previous ad hoc affair, with each regiment's battalions being merged to form a battlegroup. The Grenadier battlegroup consisted of the tanks of the 2nd Battalion and the motor infantry of the 1st Battalion, Grenadier Guards. The 1st Grenadier were a special case, as they traded in half their anti-tank guns to form extra infantry from the crews to give themselves the manpower to achieve this task. This required some rearranging of the division: although occasionally altered, the Grenadier and Irish groups formed the 5th Brigade, and the Coldstream and Welsh groups made the 32nd Brigade. Machine-gun support was provided by the Grenadier Guards for the 5th Brigade and the Royal Northumberland Fusiliers in the 32nd.