Thornton was a member of the
Wanderers club, to whom he was probably introduced by
E. E. Bowen, a master at Harrow School. In March 1870, along with Bowen, he was invited to play for the English XI in a match arranged by
C. W. Alcock against a side representing Scotland. This was the first of
a series of matches played over the next two years, before the
first official football international in November 1872. There was no score in the match until 75 minutes had elapsed, when the English goalkeeper moved out of goal to play upfield; the Scots took advantage of the exposed goal when
Robert Crawford scored with a shot from distance: England fought back to score through
Alfred Baker to salvage a
draw a minute from the end of the game. As well as being a member of the Wanderers, Thornton played for the
Harrow Chequers. On 14 October 1871, he played for Harrow Chequers against the Wanderers; the teams played out a 0–0 draw. The
Morning Post mentioned Thornton as "conspicuous for excellent play". Three days later, Thornton played for the Wanderers in a 1–0 victory over the Civil Service. ==Professional career==