Brave and the Bold #113 (1974)

After winning the election, the new mayor of Gotham City forces Batman to retire in favor if instating the Metal Men as his replacement under the idea that the six robots could better defend Gotham City. Indignant, Batman refuses to retire, however after Batman bungles a truck robbery (which is stopped by the Metal Men) the mayor is forced to place a court order preventing Batman from acting in the city. Deciding to accept reality, Batman decides that he should retire and resume his daily life as Bruce Wayne. The next day at work at Wayne Enterprises, Bruce is surprised when armed men break into the office (led by a man named One Arm) and hold him and the entire building hostage. They are threatening to kill everyone with a special gas if their demands are not met, which is a ransom of the entire Wayne Enterprises net value. The Metal Men are sent in to sneak around and try to find the gas and destroy it before it can kill the hostages, but they are found out and ordered to leave. With no place left to turn, the mayor concedes to Jim Gordon's request to call Batman for help. With One Arm and his men elsewhere, and spotting the bat signal, Bruce changes into Batman and tries to find the gas himself. His search is cut short when he notices One Arm's men returning to his office, so he returns and changes back to Bruce Wayne. Forced to give away the ransom, Jim Gordon agrees to do it. However, One Arm shoots Gordon in cold blood, when Wayne tries to stop them from getting away, they tie him to the Y of the Wayne Enterprise building's sign. Bruce then realizes where the gas is hidden because it's the only part of the sign not lit up. Alerting the Metal Men, who break Bruce free and destroy the gas, Bruce sneaks off and changes into Batman and goes after One Arm in his Whirly-Bat. He easily causes them to crash their copter into a tree where they are arrested. Resuming his Bruce Wayne guise, he later returns to the Metal Men where he learns Jim Gordon is expected to recover. He tells them that One Arm targeted Wayne Enterprises because One Arm was once captured by Batman, and sought revenge through Wayne due to their close connections.