i had a discussion like this with a friend of mine for a while. we decided that it would be best to wear a giant rubber ducky costume with rubber tubes for arms and legs, because zombies cannot bite through the rubber nor scratch you.
then he decided to run and experiment... he had a katana he bought from somewhere and put it over his head and swung it, then tried to replicate that force with a weight machine. then he determined that an average male can swing a sword of that weight about 52 times before they got exhausted. he actualyl ahd real numbers for the weight and average speed of the swing. then he calculated that something like an army of 20 guys, 10 in the front row, 10 in the rear... could mow down a horde of zombies. once the first row was tired after 50ish swings they would trade places with the 2nd row and have enough time to recover. it was scarry because it actually seemed do-able. then i added "use the rubber ducky suits" and we figured we had an invincible army. if they got overwhelmed for whatever reason they could jump into a lake or ocean and rest for a while as well as store food/drinks in their rubber ducky suits.