Their first big achievement came in 1912 , when they won the Westphalian championship after a 5 -- 1 win over BV 04 Dortmund in the final .
After playing on various grounds , Arminia moved to a new home at the Pottenau in 1910 .
Arminia 's first big achievement came in 1912 , when they won the Westphalian championship after a 5 -- 1 win over BV 04 Dortmund in the final .
After playing on various grounds , Arminia moved to a new home at the Pottenau in 1910 .