On the 23rd May 1944, 2 Canadian Infantry Brigade attacked the Adolf Hitler Line between Acquino and Pontecorvo, Italy. Sapper Harrison was detailed as a member of a mine sweeping party which moved in support of the Princess Patricia's Canadian Light Infantry, the leading battalion. At 0740 tanks of the North Irish Horse encountered mines at 74719, 6. This mine sweeping party moved forward and in the face of heavy enemy fire began to sweep a lane for the tanks. During this action both the officer and Sergeant moving with his party were wounded and unable to carry on. Sapper Harrison, showing great determination, then took charge of the sweeping party and in spite of ever increasing enemy fire completed the task. As a result of this gallant action the tanks were able to push on to give the infantry the close support they sorely needed. Sapper Harrison's coolness, determination and devotion to duty are worthy of the highest praise.
See Sappers on the Hitler Line – May 1944 for background.