Like a normal standard, a battle standard adds +1 combat result in a close combat if it is in a friendly unit. Unlike a normal standard, a battle standard adds this +1 even if another standard is present. If, by some unusual circumstance, there are two battle standards on the same side in the combat, you can only count the bonus for one (this might happen with allied armies, see the Allied Armies chapter).
Source: Warhammer Fantasy: 8th Edition
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