How is combat done? If 2 friendly units total might = 1 enemy unit total might, do both friendly units die?

To determine the outcome when two friendly units have a combined Might equal to one enemy unit, we look at the Combat Damage Step (Rule 460).

Combat Damage Resolution

According to Rule 460.2, combat damage is resolved by summing the current Might of all units on each side and assigning that total as damage to the opposing units. If the totals are equal, each player has a total amount of damage to distribute equal to that sum.

Does both friendly units die?

Yes. When the total Might of one side equals the total Might of the other, and that total is sufficient to reach the lethal threshold for the opposing units, the rules dictate that all opposing units will be destroyed.

1. Mandatory Assignment: The defender is required to distribute their total Might as damage to the opposing units.
2. Lethal Damage Assignment (Rule 460.2.c.3 & 460.2.c.4):
   • The defender must assign lethal damage to one unit in full before moving to the next.
   • The defender cannot assign more damage to a unit than is necessary to make it lethal, unless they have already assigned lethal damage to all other available targets and have damage remaining.
3. The Outcome: Because the enemy unit’s total Might equals the combined Might of your two units, the enemy has exactly enough damage to meet the lethal threshold for both of your units sequentially. Under these rules, the defender is required to assign lethal damage to the first unit and, because they have remaining damage, assign the rest to the second unit until it is also lethal.

Summary of Combat Rules

• Assignment (Rule 460.2.c): Players distribute their total Might as damage to enemy units.
• Sequential Requirement (Rule 460.2.c.3): You must fully satisfy the lethal damage threshold for one unit before assigning damage to another.
• Efficiency Requirement (Rule 460.2.c.4): You cannot "over-assign" damage to a unit if there are other valid targets remaining that have not received lethal damage.

In short: If the enemy's total Might is sufficient to reach the lethal threshold for both of your units, the rules force the defender to assign that damage sequentially, resulting in both of your units being destroyed.

Note: I could not fully verify this ruling against the retrieved rules.