council added the motto "Heaven's Light Our Guide" to the medieval coat of arms. Except for the celestial objects in the arms, the motto was that of the Star of India and referred to the troopships bound for British India which left from the port. The crest and supporters are based on those of the royal arms, but altered to show the city's maritime connections: the lions and unicorn have fish tails, and a naval crown and a representation of the Tudor defensive boom which stretched across Portsmouth Harbour are around the unicorn. During the Second World War, the city (particularly the port) was bombed extensively by the Luftwaffe in the Portsmouth Blitz. Portsmouth experienced 67 air raids between July 1940 and May 1944, which destroyed 6,625 houses and severely damaged 6,549. The air raids caused 930 deaths and wounded almost 3,000 people, many in the dockyard and military establishments. On the night of the city's heaviest raid (10 January 1941), the Luftwaffe dropped 140 tonnes of high-explosive bombs which killed 171 people and left 3,000 homeless. Many of the city's houses were damaged, and areas of Landport and Old Portsmouth destroyed; the future site of Gunwharf Quays was razed to the ground. The Guildhall was hit by an incendiary bomb which burnt out the interior and destroyed its inner walls, although the civic plate was retrieved unharmed from the vault under the front steps. After the raid, Portsmouth mayor Denis Daley wrote for the Evening News: Portsmouth Harbour was a vital military embarkation point for the 6 June 1944 D-Day landings. Southwick House, just north of the city, was the headquarters of Supreme Allied Commander Dwight D. Eisenhower. A V-1 flying bomb hit Newcomen Road on 15 July 1944, killing 15 people. 1945 to present Much of the city's housing stock was damaged during the war. The wreckage was cleared in an attempt to improve housing quality after the war; before permanent accommodations could be built, Portsmouth City Council built prefabs for those who had lost their homes. More than 700 prefab houses were constructed between 1945 and 1947, some over bomb sites. The first permanent houses were built away from the city centre, in new developments such as Paulsgrove and Leigh Park; construction of council estates in Paulsgrove was completed in 1953. The first Leigh Park housing estates were completed in 1949, although construction in the area continued