As printed in Charles H. Baker's The Gentleman's Companion, the Fourth Regiment cocktail is described as "merely a Manhattan Cocktail made in 4 oz size, spiced with 1 dash each of Angostura and orange bitters—but why the last was included we have never understood as the Angostura dominates." Many modern accounts detail that the drink was originally made with Peychaud's instead of Ango, though, which is the approach the team at Anvil Bar & Refuge decided to follow.