[7] While playing rugby union at Bridgend RFC, in 1910 Gronow won four caps for Wales.

Ben Gronow played as a forward in Huddersfield's 2–8 defeat by Wakefield Trinity in the 1910 Yorkshire Cup Final during the 1910–11 season at Headingley, Leeds on Saturday 3 December 1910, played as a forward and scored 4-goals in the 18–8 victory over Dewsbury in the 1918–19 Yorkshire Cup Final during the 1918–19 season at Headingley, Leeds on Saturday 17 May 1919, played as a forward and scored 3-goals in the 24–5 victory over Leeds in the 1919–20 Yorkshire Cup Final during the 1919–20 season at Thrum Hall, Halifax on Saturday 29 November 1919, and played as a forward and scored a goal in the 4–10 defeat by Hull F.C.

[10] In 1925 Gronow became the first British player to move down under when he went from Huddersfield to Grenfell, New South Wales as their coach but returned two years later.

In addition, prior to the 1949–50 season, the archaic field-goal was also still a valid means of scoring points.

in the 1930s, however when a history of the club was produced some years later, due to his previous rugby league associations, he was identified as 'unknown' in a team photograph.