Because the original Day of Defeat is seldom played these days, a lot of the time you'll be up against bots. They're more predictable, but also much faster on the draw. When facing them in large groups, you need to find cover. Once you do, do quick side steps in and out of your covered area and take shots at them with the k98 or grand. Be careful not to do this too fast or you'll get hit by the tail end of their initial reaction aiming/firing. From what I've noticed, you'll miss the tail end of their fire by waiting 2-3 seconds between shots and they'll forget you're there after 5-9 seconds. I'm impatient and wont wait that long, but your risk of being taken down by a cheap bot is reduced significantly when using this tactic and waiting a bit longer in between pop outs.