One or two units can be named, but two can be named only if both are of the same type and from the same corps. Note that two units can be named even if the attack is narrow.
This means, assuming all units are in proper combinations:
A) If I am defending a wide approach with a corps of 4 units I can name two leads and 2 counter-attackers.
B) If I am defending a wide approach with 4 detached units I can name 2 leads but only 1 counter-attacker.
C) If I am defending a narrow approach with a corps of 3 units I can name 1 lead and 2 counter-attackers.
D) If I am defending a narrow approach with 3 detached units I can name 1 lead and only 1 counter-attacker.
Yes, No, Maybe So?