"German guns captured at Amiens." Field guns in rows. Negative number is reversed so photo MAY be reversed. The Battle of Amiens (also known as the Third Battle of Picardy which began on 8 August 1918, was the opening phase of the Allied offensive later known as the Hundred Days Offensive that ultimately led to the end of the First World War. Allied forces advanced over 11 kilometres (7 mi) on the first day, one of the greatest advances of the war, with Henry Rawlinson's British Fourth Army playing the decisive role. The battle is also notable for its effects on both sides' morale and the large number of surrendering German forces. This led Erich Ludendorff to describe the first day of the battle as "the black day of the German Army". Amiens was one of the first major battles involving armoured warfare and marked the end of trench warfare on the Western Front, fighting becoming mobile once again until the armistice was signed on 11 November 1918. From July 1918 the Allies launched offensives against a weakening German defensive line. This push by the Allied Armies on several parts of the Western Front succeeded in once again creating a war of movement. The Allied Amiens Offensive or Third Battle of Picardy (8th August - 3rd September 1918) was an attack launched in fog against the German positions by the British Fourth Army, comprising an attack in the centre of a 14 mile front by 11 British divisions and the left wing of the French First Army on their right flank. Canadian forces would attack in the centre sector. An attack by 435 Allied tanks went in ahead of the infantry assault. By the end of 8th August the British divisions had pushed the Germans about 10 miles east of their position that morning. The swift advance by the British and French divisions caught the Germans by surprise. By the end of the second day of the battle 30,000 German prisoners had been captured and 300 artillery pieces. On 10th August the French Third Army launched attacks in the southern sector of the advance. Montdidier was re-captured and the Paris-Amiens railway line was once again in Allied control. On 12th August the first phase of the battle drew to a close. The second phase of the offensive began on 21st August as the Second Battles of the Somme 1918. The French Tenth and Third Armies, and the British Third and First Armies attacked. The ANZACs captured ground north of the Somme river at Péronne and Mont St. Quentin. Canadian forces captured ground near Quéant. By 4th September the German forces had withdrawn to the Hindenburg Line, the position from which they had advanced to make the offensives in the earlier part of the year. The two phases of the Allied Amiens Offensive comprised the main battles of: Battle of Amiens (8th - 11th August 1918) Battle of Montdidier (8th - 15th August 1918) Battle of Noyon (17th - 29th August 1918) Battle of Albert 1918 (21st - 22nd August 1918) Second Battle of Bapaume (21st August - 3rd September 1918) Battle of the Scarpe (26th August 1918) Battle of Mont-St. Quentin (31st August - 3rd September 1918) Battle of the Drocourt-Quéant Line (2nd - 3rd September 1918)