After this the division was rested and many months of static warfare ensued, the division then went on to break out of the Eighth Army's bridgehead with the second wave in the spring offensive, Operation Diadem, the Fourth Battle of Monte Cassino. The 4th Princess Louise Dragoon Guards, the reconnaissance (or 'recce') regiment serving with the 1st Canadian Division, was the first of the Eighth Army's units to cross the Hitler Line in May 1944, below Pontecorvo in its armoured cars.