fill -318 -50 -6 -296 -60 30 air replace gravel

fill -313 -53 12 -311 -59 12 gravel replace air
fill -301 -53 12 -303 -59 12 gravel replace air

summon armor_stand -307 -56 -2 {NoGravity:1b,Silent:1b,Invulnerable:1b,Marker:1b,Invisible:1b,equipment:{head:{id:"minecraft:blue_banner",count:1}},Tags:["blueflag","flag"]}
summon armor_stand -307 -56 26 {NoGravity:1b,Silent:1b,Invulnerable:1b,Marker:1b,Invisible:1b,equipment:{head:{id:"minecraft:red_banner",count:1}},Tags:["redflag","flag"]}