Yes, 4.. a6 was a criminal waste of time in that situation. It practically forced you to sac.
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This is from a game I played. I ran it through Chess.com's 2500-strength computer analysis, and, according to it, my only major mistake was 10. Bxd6+??, which is amazing since I was so bold as to sack two pieces in a row! (the second sack was rated as a Mistake but not a Blunder!)
I include all the annotation from Chess.com's Chess Engine