[1][2] The club's first competitive football came in the West of Scotland Cup for non-senior clubs, reaching the third round in 1877–78,[3] but losing to reigning champions Marchtown in the first round at Pollokshields in 1878–79.

[5] Despite this competitive setback, Windsor turned senior at the end of the season and entered the 1880–81 Scottish Cup.

[8] The club did enter the 1881–82 Scottish Cup, and was drawn to play Whitefield, but dissolved before the tie could take place.

[9] The club wore white jerseys and knickers, and red and black hose.

[11] In order to join the Scottish Football Association, the club needed a private ground, and found one at Dalmarnock Park, 3 minutes' walk from the London Road car terminus,[12] either on or very close to the site used by the Thistle.