its not as simple as explained by “others”
Based on what dies first but then there is a layer of defense also based on subclass bonus(which is an undefined number)
Infantry
T2 => T4 => T6 => T8 => T10 => T12 (Pikemen)
=> T1 => T3 => T5 => T7 => T9 => T11 (Musketeers)
For cavalry:
2 => T5 => T7 => T9 => T10 => T12 (light cavalry)
=> T1 => T3 => T4 => T6 => T8 => T11 (heavy cavalry)
For Rifleman:
T1 => T4 => T7 => T8 => T10 => T12 (Riflemen)
=> T2 => T3 => T5 => T6 => T9 => T11 (Grenadiers)
Based on this most will tell you about the infantry stacking as infantry does take the first layer of hits within the tiers, So this shoudl give you an idea on what to stack up on as you build layers.
The RR links will always take you to CURRENT upload or the CURRENT Live event so good book marks.