Forum Discussion
At first I couldn‘t find out why this wasn‘t a challenge battle. But then finally I figured it out:
For a challenge battle to trigger you need to be within 4 levels of the league cap. You are in master league. That means your army needs to be levels 13,12,11,10,9 on average. Now let‘s look at your army...
You have everything at level 9, which should make this a challenge battle, however, your rifleman are level 8, thus lowering the army level to below 9. Because of this your average army level is a little short of level 9, and a challenge battle will not trigger.
If you ask „why does my army need to be at these levels???“, this system is there to stop people with really low leveled units to get challenge battles literally in every game and eventually climbing because they cannot loose.
Tl;Dr: Level up that riflemen squad.