Celtic F.C. their sixth successive league title on 2 April 2017, with a record eight league games to spare. As Celtic's unbeaten domestic run continued, they subjected Rangers to their heaviest defeat at Ibrox since 1915, 5–1, on 29 April. Celtic's 2–0 win over Hearts on 21 May saw them finish 30 points ahead of second-placed Aberdeen in the league, with a record 106 points, and the team became the first Scottish side to complete a top-flight season undefeated since Rangers in 1899. On 27 May 2017, Celtic clinched their fourth treble by defeating Aberdeen 2–1 in the Scottish Cup final. The
Celtic F.C. and World War I Celtic F.C. and World War I Over 50 contracted and former Celtic F.C. players fought in World War I, seven of whom died. Of those that fought, William Angus was awarded the Victoria Cross for bravery in battle. In the early 20th Century Celtic F.C. was already a successful club having won 10 Scottish League Championships and 8 Scottish Cups in their 26-year history (by 1914). Celtic won the league four times in a row during World War I. During this run of league championships, Celtic went 62 matches unbeaten from 20 November 1915 until 14 April 1917, a record