Starting out, a typical character has 10-15 HP. A typical weapon deals 6-12 damage. A measley 2HD monster does 15 HP damage. Do the math - combat is over fast, one way or another.
- Smart positioning (Fast or Slow phase?)
- Resource management (When to Second Wind?)
- Defensive choices (Parry, dodge, or hope your armor holds?)
- Knowing when to run (First flee is painful, third is catastrophic) During combat, on your turn, you take a single action.