411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. e5/3...Bf5/4. Nc3/4...e6/5. g4/5...Bg6/6. Nge2/6...c5/7. h4
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Van der Wiel Attack
7. h4 · Caro-Kann Defence - Advance Variation, Van Der Wiel Attack
Black must save the bishop, and their most active response is 7... h5. At first 7... h6 looks preferable, as after 8. Nf4 it allows the bishop to retreat and the pawn to be safe, but Black can safely give up the h pawn in exchange for counterplay on the queenside.
Theory table
7... h5 7... h6
Caro–Kann Defence