I don't want to be rude, because I respect your work. But if you call that "strategy"... You are just kidding yourself. Okay, let me give you some examples of how this is just dumb and involves "strategy"...
Case 1: Your opponent has every type of units, since there are no other mechanis than attack values and defense values and the order units are assigned to attack other units is fixed this is easily exploited for attackers advantage without any worries it might not work:
rowdy:1
bouncer:2
knifer:1
gunman:1
sniper:1
hitman:1
ninja:1
big_mama:1
bazooka:1
mercenary:1
VS
rowdy:1
bouncer:1
knifer:2
gunman:2
sniper:5
hitman:2
ninja:2
big_mama:1
bazooka:5
mercenary:1
If you put this in simulator, you get a draw with big mamas surviving for both sides. This shows a rough ratio (not exact ratio, but it is easily calculable as attack vs def on each unit). After that you send another attack to take everything you can. So this is strategy number 1.
Case 2: Only other strategy is when the defender doesnt have all different types of units. When you want to attack someone and they have for an example 100 bouncers and 200 knifers. This is again easily exploited by the attacker because of how the battle works:
rowdy:1
bouncer:1
knifer:0
gunman:0
sniper:25
hitman:0
ninja:20
big_mama:0
bazooka:0
mercenary:0
VS
rowdy:0
bouncer:100
knifer:200
gunman:0
sniper:0
hitman:0
ninja:0
big_mama:0
bazooka:0
mercenary:0
So this is an easy win while only losing decoys, 1 rowdy and 1 bouncer and deleting 300 of their units. This is just stupid but it is what you call "strategy".
I call this around "20 seconds of using a calculator".