Although there are many factors to win or lose, such as terrain, commander in chief and strategy, here we only compare the equipment and basic tactics of both sides. My opinion is:

1)5000 to 1 000 is only a combat level at best, and the chances of the Han army winning are not great. Because the elite of the Han Dynasty lies in the light cavalry, which has strong mobility, but is not strong in protection and aggression, such equipment is acceptable to deal with the Huns with worse equipment, but it will be completely at a disadvantage in the fierce hand-to-hand combat with Roman heavy infantry. However, if the number of people increases by 10 times, that is, 50,000 to 100, and rises to the level of battle or war, the winning rate of the Han army will be greatly improved. Because excellent strategists will take full advantage of the mobility of the Han army, such as conducting long-range attacks on the supply lines of the Roman legion.

2) From 5000 to 1 000, the Ming army defeated the Crusaders. The reason is also in the equipment. Firearms have been widely equipped in the Ming army, while the Crusaders are still using cold weapons.