U-Boats Against Canada: German Submarines in Canadian WatersThe U boats constituted a serious threat to North American security and a major challenge to coastal and convoy defence. Hadley reveals the military and political impact on Canada of in shore submarine warfare and vibrantly documents the successful German strategy of deploying daring long range solo sorties to pin down the enemy close to home., ISBN13: 9780773508019 ISBN10: 0773508015 Material Type: paperback