Mackie was a young, strong right back, and made his debut on 9 December 1922 against Birmingham City. He soon became a regular in the Arsenal side, making 23 league appearances that season and 31 the next.
Mackie, a promising young right back, made his professional debut for Arsenal on December 9th, 1922, against Birmingham City. He quickly established himself as a regular player, contributing to the team with 23 league appearances in his first season and 31 the following year.