Funnily enough, the main rival of the Detroit Falcons has actually changed fairly significantly in the time that I've been in the league. During my first few seasons in the SHL, way back in the early S30s, the main rival of the team were the Montreal Militia, due to some crossover in GMs and one or two situations that exacerbated the rivalry between the two groups of users. Some hard fought playoff series ensued, and both teams would go on to look to outdo the other at every opportunity. Now however, the team's undeniable main rival is the St. Louis Scarecrows. It's hard to say how it actually started, but this rivalry was actually fairly bitter during the S40s, with some big fallouts between various users on both sides, which undeniably led to the on-ice rivalry escalating massively. Despite the lack of real geographical proximity, the two teams have managed to establish a fierce competitive rivalry. I believe it's a bit more kind-spirited now, but there's undeniable history between the two franchises and it goes without saying that every time the two teams meet there's a bit more attention paid to how the game plays out!