The assault by the 8th Brigade, 3rd Infantry Division, on Sword Beach was somewhat similar to the US 4th Infantry Division at Utah, landing along a fairly narrow corridor only two battalions wide but thereby concentrating the entire force against a single strongpoint. The 1st South Lancs landed west of WN20 in La Breche, codenamed "Cod." This strongpoint included an 88mm gun in an H677 enfilade bunker as well as three 50mm pedestal guns. At the same time, the neigh boring 2nd East Yorks landed on its eastern side. The gun bunkers knocked out many Sherman flail tanks as they attempted to clear paths off the beach. The British infantry moved over the beach as quickly as possible to avoid the heavy fire against the shoreline. After the wire entanglements were breached, Cod was assaulted by elements of both battalions supported by DD tanks from 13th/18th Hussars and was overcome shortly after 1000hrs following nearly three hours of fighting. The defences in the center portion of Sword Beach had largely been eliminated once Cod was overwhelmed, but the beach remained under fire from scattered snipers, mortars and artillery located away from the beach. The German defensive positions on either side of the 8th Brigade were assigned to Commando units. In another parallel to the landings on the American beaches and the assault by the Rangers on Pointe-du-Hoc, the task of silencing the artillery batteries at the extreme eastern side of Sword Beach was assigned to 4 Commando. The battalion landed away from the defences, and advanced eastward to attack the strongpoint from the landward side. Two French troops were attached to 4 Commando, and led the attack on WN10. The lightly armed French Commandos had a hard time dealing with the numerous defences, which included a 75mm field gun in an H626 bunker, and the attack stalled. By this time, Sherman tanks from the neighbouring 8th Brigade had arrived near Ouistreham, and a DD tank was dispatched to assist in the Commando assault. Once the WN 10 defences were overcome with the help of tank fire, 4 Commando proceeded to assault the artillery battery in the StP 08 strongpoint in Riva Bella. A multi-storey observation tower at the far end dominated the strongpoint. As the Commandos fought past an outer ring of tobruks and other defences into the heart of the battery positions, they realised that the Germans had withdrawn the guns due to the pre-invasion bombardment, much as had occurred at Pointe-du-Hoc. German troops continued to hurl grenades from the observation tower, but rather than waste time and lives to capture the structure, 4 Commando left it for clean-up by follow-on troops. One of the primary objectives of British airborne troops in the area east of Sword Beach was strongpoint WN01, the Merville battery. The site is now preserved as a museum. It had been armed with 100mm field guns at the time of their capture. Also one of the original kettle gun pits built prior to the construction of the case mates. To the west, 41 RM Commando assaulted strongpoint WN21 (Trout) in St Lion-sur-Mer, which included a single 75mm field gun and two pedestal-mounted 50mm guns in open pits. Strongpoint W 21 was deserted but the neighbouring chateau proved more difficult and 41 RM Commando was unable to proceed to its secondary objective, the Luftwaffe radar station at Douvres, even with the help of tanks. With the defences on Sword Beach thoroughly penetrated, albeit not entirely subdued, the follow-on waves moved off the beaches to carry out their further objectives. The 185th Brigade proceeded through Colleville-Plage on their way to Caen, encountering two major fortified areas in the process: an artillery battery in strongpoint WNI6, codenamed Morris, and the heavily fortified headquarters complex of Grenadier Regiment 736 in strongpoint WNI7, codenamed Hillman. The 1st Suffolks overwhelmed the artillery battery at WN16 and then proceeded on to the Hillman complex. Minefields and barbed wire encircled W 17, and the British infantry fought their way into the strongpoint after breaching the wire. The personnel bunkers inside it were the heavy bomb-proof type as used on the Westwall, and not the more vulnerable tobruk type common elsewhere on the D-Day beaches. As a result, the 1st Suffolks brought up some 17 -pdr anti-tank guns, attempting to crack open the bunkers by blasting their armoured cupolas. There were so many bunkers and firing ports that it took the 1st Suffolks the entire day to overwhelm the headquarters, not finally eliminating the resistance until 20:15hrs. Although casualties in the 1st Suffolks were not particularly heavy from the attack on Hillman, during the afternoon the 1st Royal Norfolks unwarily marched through a field within range of the strongpoint, and suffered about 150 casualties due to machine-gun fire. The prolonged resistance by strongpoint WNI7, as well as the later counterattack by elements of 21.Panzer-Division, were some of the reasons that the 185th Brigade was unable to press on to its intended objective that day, the city of Caen. One of the most imposing fortifications on Sword Beach was this observation position built into an existing water tower in the Trout strongpoint in Ouistreham. It has been preserved as Grand Bunker of the Atlantic Wall museum.