When attacking with cards who deals damage to who?

By Dainank, in Warhammer 40,000: Conquest - Rules Questions

When you command unit to attack another unit, do both units deal damage to each other, or does the attacker only deal damage to the defender, and the defender dealsno damage to the attacker.

When you command unit to attack another unit, do both units deal damage to each other, or does the attacker only deal damage to the defender, and the defender dealsno damage to the attacker.

Attacker only.

Page 26, 3.2.6

Edited by Toqtamish