Took me twice for blue vs all rest. Will try with only yellow and magenta later. This play was really interesting though - I was able to surround a city, while also infiltrating behind enemy lines and capturing their unguarded city. Cavalary is great for pushing a little bit past the objective to flank their guard, help infantry surround the city and finally, if lucky, could even capture an unguarded city, especially if forests are nearby for concealment.