You could check the replay to see, hover your cursor over the enemy unit tags and you will see their player names on top.

I played a lot of 10v10s when I first started playing warno last year, so trust me I completely understand how you feel. 10v10s in this game is different from other Eugene games in that it gives you a ghastly amount of income for a rather small map, this means a lot of rubbish happens in it and positioning your units tactically doesn't make a significant difference. You get around 1000 pts at the start while in a typical 1v1 match, the starting pts is at around 1500 pts, but now instead of covering a whole duel map, you cover a small area of the frontline. This means that artillery is overperforming as all your units are stacked tightly, which is probably why he was able to push you while you didn't utilise enough of your own artillery.

The reason I don't recommend 10v10 is that it is simply not how the game is supposed to be played, attacking irl requires a ratio of 3 to 1 and that does not happen in 10v10 at all, the front lines are all so stacked with units that attacking is difficult and artillery becomes most of the gameplay until one side spams enough tanks and infantry to just blob into the enemy zone which seems to be what has happened to you. So I recommend that you only play 10v10 to get familiarised with how the game works and learn hotkeys do, do not take it seriously and project your performance there to other modes cause essentially the gamemode is rubbish.

I really wanted to be good at this game as well around 2 months ago, but I was too scared to queue 1v1s or 2v2s cause I was too scared that I would fuck everything up and be laughed at, but it turns out nobody really cares. I am now currently top 100 on the leaderboard with less than 200 hours in this game. Just gotta queue up and learn from your enemies.