Hi, so back in 2012/2013 there was this big server, where two teams were fighting against each other. Each player was recieving a kit with coloured leather armor, sword and bow with few stacks of arrows and some blocks to build and then two team fought in a massive war. If you can name any server like this I would be very happy to see something like this:)
You might be thinking of Overcast Network/OC.TC? That server is down now, but Hypixel has a gamemode that is just like it called Capture The Wool. There is also a server called the Stratus Network which has the same codebase as OCTC did, essentially a reboot.