Title: Second Battle of Ypres
Content:  During the First World War, the Second Battle of Ypres was fought from 22 April – 25 May 1915 for control of the strategic Flemish town of Ypres in western Belgium. The First Battle of Ypres had been fought the previous autumn. The Second Battle of Ypres was the first mass use by Germany of poison gas on the Western Front.
Title: Ypres Salient
Content:  The Second Battle of Ypres occurred from 22 April to 25 May 1915, the British and French defending Ypres and the corner of Belgium around Veurne from German occupation but escalating trench warfare in the salient. Both sides vied for control of tactically important areas along the line. Obtaining control of the few hills and ridges became the objective of this battle in which poisonous gas as a weapon was first deployed and the widespread destruction and evacuation of Ypres came about. During this battle, the Allied units were forced to draw back from Zonnebeke and St Julien to a line of trenches closer to Ypres as German troops held the village of Hooge on Bellewaerde Ridge. This line defined the Ypres Salient for over two years, during which Hooge lay in one of the easternmost sectors of the salient and was much contested. This situation changed little, despite extensive British tunnelling prior to the Battle of Messines in June 1917 and the Third Battle of Ypres (Passchendaele) from July to November. During these battles, tactics shifted from offensive tunnelling to maintaining shelters and constructing dugouts.
Title: Second Battle of Passchendaele
Content:  The Second Battle of Passchendaele was the culminating attack during the Third Battle of Ypres of the First World War. The battle took place in the Ypres Salient area of the Western Front, in and around the Belgian village of Passchendaele, between 26 October and 10 November 1917. The Canadian Corps relieved the exhausted II Anzac Corps, continuing the advance started with the First Battle of Passchendaele and ultimately capturing the village. Beyond gaining favourable observation positions, the battle was intended to gain drier winter positions on higher ground. The assault position was directly south of the boundary between the British Fifth and Second Armies. The Canadian Corps was to attack with support of 
Title: Oxfordshire and Buckinghamshire Light Infantry
Content:  weather, that began the following day, not stopping until just on the outskirts of Paris, then halting the German advance at the First Battle of the Marne (5–9 September). The 2nd Ox and Bucks later took part in all the subsidiary battles of the First Battle of Ypres (19 October – 22 November) that saw the heart ripped out of the old Regular Army, with 54,000 casualties being sustained. In the First Battle of Ypres the 2nd Ox and Bucks first engagement with the enemy was on 20 October in an attack on the Passchendaele ridge. The battalion had heavy casualties: four 
Title: Second Battle of Ypres
Content: Lance Sergeant D. W. Belcher, London Rifle Brigade (TF), 11th Brigade, 4th Division ; Captain E. D. Bellew, 7th Battalion, British Columbia Regiment, 2nd Canadian Brigade, 1st Canadian Division ; Jemadar Mir Dast, 55th Rifles (att. 57th Rifles), Ferozepore Brigade, Lahore Division ; Lance Corporal F. Fisher, 13th Battalion Royal Highlanders of Canada, 3rd Canadian Brigade, 1st Canadian Division ; Company Sergeant-Major F. W. Hall, 8th Battalion, Winnipeg Rifles, 2nd Canadian Brigade ; Private J. Lynn, 2nd Lancashire Fusiliers, 12th Brigade, 4th Division ; 2nd Lieutenant W. B. Rhodes-Moorhouse, 2 Squadron, Royal Flying Corps ; Captain F. A. C. Scrimger, (Canadian Army Medical Service), 14th Battalion, Royal Montreal Regiment ; Corporal I. Smith, 1st Manchesters, Jullundur Brigade, Lahore Division ; Private E. Warner, 1st Bedfordshires, 15th Brigade, 5th Division 
Title: 2nd Battalion (Eastern Ontario Regiment), CEF
Content:  On 8 February 1915, the battalion was mobilized for war. They sailed out of England aboard the S.S. Blackwell, bound for France. The battalion's first taste of battle came later that month, on 19 February, when they entered the trench system at Armentières. Their first battle was the Second Battle of Ypres, in April 1915. When the battalion pulled out of the battle, on 29 April, the final count included 6 officers and 68 other ranks killed, 4 officers and 158 other ranks wounded, and 5 officers and 302 other ranks missing, for a combined loss of 543 men. The 2nd Battalion also fought at the battles of Ypres, St. Julien, Festubert, Pozières, Vimy (1917), Arleux, Hill 70, Passchendaele, Amiens, and Canal du Nord, to name only a few. By the end of the war, 242 officers and 5,084 other ranks had fought with the battalion. Of those, 52 officers and 1,227 other ranks were killed in action, accidentally killed, or died of their injuries.
Title: Second Battle of Ypres
Content: Battle of Gravenstafel: Thursday 22 April – Friday 23 April ; Battle of St. Julien: Saturday 23 April – 4 May ; Battle of Frezenberg: 8–13 May ; Battle of Bellewaarde: 24–25 May In A record of the Engagements of the British Armies in France and Flanders, 1914–1918 (1923 [1990]) E. A. James used The Official Names of the Battles and Other Engagements Fought by the Military Forces of the British Empire during the Great War, 1914–1919, and the Third Afghan War, 1919: Report of the Battles Nomenclature Committee as approved by the Army Council (1921) to provide a summary of each engagement and the formations involved. In The Battles of Ypres, 1915 six engagements involving the Second Army were recorded, four during the Second Battle (22 April–25 May).
Title: Second Battle of Ypres
Content:  was passed to the troops to urinate on their handkerchiefs and place them over their nose and mouth. The countermeasures were insufficient, and German troops took the village. The next day the York and Durham Brigade units of the Northumberland Division counter-attacked, failing to secure their objectives but establishing a new line closer to the village. On 26 April 4, 6 and 7 Battalions, the Northumberland Brigade, the first Territorial brigade to go into action, attacked and gained a foothold in the village but were forced back, having suffered 1,954 casualties. Despite hundreds of casualties, the 2nd Battalion Royal Dublin Fusiliers participated without respite in the battles at Frezenberg and Bellewaarde. On 24 
Title: Battle of the Ypres–Comines Canal
Content:  The Battle of the Ypres–Comines Canal was a battle of the Second World War fought between the British Expeditionary Force (BEF) and German Army Group B during the BEF's retreat to Dunkirk in 1940. Part of the Battle of Belgium and the much larger Battle of France, it started in the afternoon of 26 May and reached its maximum intensity on 27 and 28 May. Locally it is referred to as the Battle of the Canal and it is sometimes incorrectly referred to as the Battle of Wytschaete. Its official British Army name, which is borne on the battle honours of a number of regiments, is that given here.
Title: Second Battle of Artois
Content:  Second Battle of Ypres (21 April – 25 May), which the Germans ended to reinforce the Artois front. The initial French attack broke through and captured Vimy Ridge but reserve units were not able to reinforce the troops on the ridge before German counter-attacks forced them back about half-way to their jumping-off points. The British attack at Aubers Ridge was a costly failure and two German divisions in reserve were diverted south against the Tenth Army. The British offensive was suspended until 15 May, when the Battle of Festubert began and French attacks from 15 May to 15 June were concentrated on the flanks to create jumping-off points for a second general offensive, which began 

Question: where did the second battle of ypres occur?
Answer: Belgium.