So what? Just because they def you arent allowed to?
Also I cant image your Horde defs with 40 ppl. And if, you should have no problem to rush base.
So for start deffing Balinda seems a logical way since its 100 ressources you dont have to spare.
10-15 ppl + Balinda can achieve a lot esp when a big chunk of Horde is still in garrison. If you die stay mid and run between towers. Holding mid (both towers + Balinda) as long as possible wins AV.
The problem with defending captains is that it is very easy to quickly crush a defense team, as long as you have superior numbers.
This goes for endgame as well - although I'm not sure if defending captains works better at F2P. It almost seems to be fairly successful in recent days.
So if you have 15 on Defense - which is a high estimate. Generally it's much fewer - but let's assume 15. The enemy team should be sending at LEAST 30 to your Captain. That's the point of the early zerg - you kill the captain while you are all still grouped.
30 v 15 will crush that force. It's a simple number advantage. Meanwhile, you have maybe 15 people on their captain (assuming 10 people from both sides are doing solo missions or getting an early start on bunkers/towers). You will probably finish their captain in time, but they will have defeated yours much quicker.
Maybe this is where my assessment doesn't hold up by comparing F2P to Endgame, but as far as I can tell, it should.
30 v 15 + Captain will be faster than 15 vs Captain. This is because the 30 v 15 is not a 1-for-1 trade of Enemy-to-Ally. In other words, your force of 15 against THEIR captain is dwarfed by their force of 30 against YOUR captain + Defense.
It seems to me that the best game plan is to split Offense and Defense after the enemy Captain, and go from there. Generally a 15 man team of back-cap Defense will win a game.
On an individual level, I do not suggest back-dooring unless you can stealth. Rogues/Druids are excellent at going for Dun'Baldar / Frostwolf Towers early on. They have the potential to carry games if they can successfully burn a tower early before there is enough of an organized defense.
Non-Stealthies should travel as a group. Defending Towers that your team has captured is JUST as important as back-capping Towers that the enemy team has captured. Those should be the goals of the game.
Never, under any circumstances, should you attempt to kill the Enemy Faction Leader - You lose 1 reinforcement for each death your team has to that Faction Leader. That is literally throwing away the game.