Your unit has a certain time interval between two attacks.
When you attack each other, you retreat immediately. The next time you can attack, A will land or H will live, and your soldiers will attack each other again. Then back off and attack.
The other party will not catch up with you, or it will take more time to catch up with you, so that you can do the most harm to the other party with the least loss.
Riflemen deal with Zerg dogs and predators deal with Berserker. This is often used, but it is more difficult to practice, especially riflemen.
At present, these tricks are very popular in StarCraft II, but the most essential and key point of the game is operation and macro control. If the landlord is a novice, he should pay more attention to the construction sequence and operation mode. Although "dumping" soldiers is useful, it is only secondary.