In this guide you need only 1 trip if you have 3 tavern generals or BHGs.
199 1
150 50
200
Notes:
Top row should attack camp2 first as noted, the camps are switched on the map and no interception is intended.
You should most of the time have the 200 required for camp10 but 195-199 is possible. If you have less than 200 send only the 1 along, you'll most likely lose 1 above average. Any other units sent will be lost in vain. You can of course send more backup recruits if you have more than 3 generals but it's not necessary.
Variance in the losses is very tight. In practical appliance of the guide the results were very close to average [329,329,328]
And finally, please feel free to propose a better attack in any part of the guide.
Higher resolution Here.
(Update) Illustrated guide:
C1: 4 1 195
C2: 1 199
C3: 40 1 130 29
C4: 19 1 180
C5: 3 1 196
C6: 30 1 167 2
C7: 11 1 188
C8: 63 1 86 50
C9: 89 75 36
C10: 200
C11: 30+
C12:
W1: 60
W2: 69 81 50