Once an amphibious assault starts, victory tends to go to the side which can reinforce the beachhead most quickly. Occasionally, the amphibious forces do not expand their beachheads quickly enough to create a "lodgement" area before the defenders can reinforce their positions; in these cases, the defending forces tend to be victorious. This is exemplified by the landing at Suvla Bay in the Gallipoli Campaign during World War I and the amphibious landing at Anzio (during Operation Shingle) as part of the Italian Campaign of World War II.