) was a Scottish

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

 football player. His favoured position was as a forward. Cassidy started his career with Motherwell

Motherwell F.C.

Motherwell Football & Athletic Club are a Scottish professional football club based in Motherwell, North Lanarkshire. The club compete in the Scottish Premier League and are one of only seven teams to have remained in this league since it was founded in 1998...

 and Blythe. In 1893, he was transferred to Newton Heath

Manchester United F.C.

Manchester United Football Club is an English professional football club, based in Old Trafford, Greater Manchester, that plays in the Premier League. Founded as Newton Heath LYR Football Club in 1878, the club changed its name to Manchester United in 1902 and moved to Old Trafford in 1910.The 1958...

, where he played in the last four league games of the season, as well as a test match against Small Heath

Birmingham City F.C.

Birmingham City Football Club is a professional association football club based in the city of Birmingham, England. Formed in 1875 as Small Heath Alliance, they became Small Heath in 1888, then Birmingham in 1905, finally becoming Birmingham City in 1943.They were relegated at the end of the...

, in which he scored to keep Newton Heath in the First Division

Football League First Division

The First Division was a division of The Football League between 1888 and 2004 and the highest division in English football until the creation of the Premier League in 1992. The secondary tier in English football has since become known as the Championship....

. After two months with the Heathens, he moved to Celtic

Celtic F.C.

Celtic Football Club is a Scottish football club based in the Parkhead area of Glasgow, which currently plays in the Scottish Premier League. The club was established in 1887, and played its first game in 1888. Celtic have won the Scottish League Championship on 42 occasions, most recently in the...

. In 1895, he returned to Newton Heath, who had by now dropped into the Second Division

Football League Second Division

From 1892 until 1992, the Football League Second Division was the second highest division overall in English football.This ended with the creation of the FA Premier League, prior to the start of the 1992–93 season, which caused an administrative split between The Football League and the teams...

. In seven seasons back with the club, Cassidy played 163 games and scored 99 goals. He went on to play for Manchester City

Manchester City F.C.

Manchester City Football Club is an English Premier League football club based in Manchester. Founded in 1880 as St. Mark's , they became Ardwick Association Football Club in 1887 and Manchester City in 1894...

 and Middlesbrough

Middlesbrough F.C.

Middlesbrough Football Club , also known as Boro, are an English football club based in Middlesbrough, who play in the Football League Championship. Formed in 1876, they have played at the Riverside Stadium since August 1995, their third ground since turning professional in 1889...

. At the latter club, he would be captain for their first game at Ayresome Park

Ayresome Park

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, also scoring the first competitive goal at the new ground. He moved to Workington

Workington A.F.C.

Workington A.F.C. is an English football club from Workington, Cumbria. They are in the Conference North, and play their home matches at Borough Park, which has a capacity of 3,101 . The club play in red, and are known locally as the Reds...

 in 1906.