Merderet were extremely scattered, with only four per cent landing in the target area. Many landed in nearby swamps, with much loss of life. Paratroopers consolidated into small groups, usually a combination of men of various ranks from different units, and attempted to concentrate on nearby objectives. They captured but failed to hold the Merderet River bridge at La Fière, and fighting for the crossing continued for several days. Reinforcements arrived by glider around 04:00 (Mission Chicago and Mission Detroit), and 21:00 (Mission Keokuk and Mission Elmira), bringing additional troops and heavy equipment. Like the paratroopers, many landed far from their drop zones. Even those that landed on target experienced difficulty, with heavy cargo such as Jeeps shifting during landing, crashing through the wooden fuselage, and in some cases crushing personnel on board. After 24 hours, only 2,500 men of the 101st and 2,000 of the 82nd Airborne were under the control of their divisions, approximately a third of the force dropped. This wide dispersal had the effect of confusing the Germans and fragmenting their response. The 7th Army received notification of the parachute drops at 01:20, but Rundstedt did not initially believe that a major invasion was underway. The destruction of radar stations along the Normandy coast in the week before the invasion meant that the Germans did not detect the approaching fleet until 02:00. British and Canadian The first Allied action of D-Day was the capture of the Caen canal and Orne river bridges via a glider assault at 00:16 (since renamed Pegasus Bridge and Horsa Bridge). Both bridges were quickly captured intact, with light casualties by the Oxfordshire and Buckinghamshire Light Infantry Regiment. They were then reinforced by members of the 5th Parachute Brigade and the 7th (Light Infantry) Parachute Battalion. The five bridges over the Dives were destroyed with minimal difficulty by the 3rd Parachute Brigade. Meanwhile, the pathfinders tasked with setting up radar beacons and lights for further paratroopers (scheduled to begin arriving at 00:50 to clear the landing zone north of Ranville) were blown off course and had to set up the navigation aids too far east. Many paratroopers, also blown too far east, landed far from their intended drop zones; some took hours or even days to be reunited with their units. Major General Richard Gale arrived in the third wave of gliders at 03:30, along with equipment, such as antitank guns and