When the walkers cornered Carl, Rosita, and the rest of their group in a nearby SUV, Richonne sprang into action and used two cars connected by wires to slice hundreds of undead ghouls literally in half at the waist/chest.
It was unquestionably one of the coolest moments in the history of the series, and we can now definitively confirm that it was also the deadliest.
As you can see from that AMC Story Sync photo, Rick and Michonne managed to kill at least 300 individual walkers during the events of the recent midseason premiere.
If you have seen the episode, you will recall that the duo made a desperate attempt to collect as many of Negan’s explosives as possible from a booby trap in the middle of a freeway as a horde of walkers barrelled down on them.