If you have ever read the Vermin Wars (really, seriously though, go read) or fought against me, you probably no what I'm about to do. And after taking a look at my teammates, you probably know there's nothing you can do to stop it either

ok, but seriously, here's my plan.
Defense
Rob is the best defender in non static situations, but Brandon might be the best defender when you know you aren't going anywhere. But, I'm going to go with a curveball. I'm leaving Sam with the Defender and waterballoons to guard the flag. The Defender has good range, and my whole plan is based on offense, so I'm counting on him not having to get into much of a firefight, thus he doesn't need much ammo. The waterballoons and good range can be used to hit anyone from a distance, especially while crossing the mini valley. His job is to patrol the ridgeline and then hit anyone before they can make it up the hill.
Offensive/Blocking Team
Rob CPS 1000
Brandon CPS 1000
Danny XP 270
Tony SS 60
The team will sprint into disputed territory as soon as the air horn is sounded. The shortest distance between two points is a straight line, and this is a strategy I constantly employ for specific parts of my team. At thermoplaye the Greeks forced the Persians into fighting in confined spaces, minimizing their numerical superiority. The blocking team will rush straight (for maximum speed) into the gap between the dense forest and the reed pond, getting into position in the woods with the path (far right end of the loop) in front of them close enough to make an ambush. Danny will be furthest to the north, that is closest to the reed pond. I want one of the nephews to be the closest to the pond that way if he gets overrun the blocking team can shift up/north (to their right) and use the reed pond to prevent being flanked. I chose Danny other than Tony because Danny has some flanking attack ability. If he gets overrun it's up to Rob to push the line north and prevent a flanking attack from the reed pond edge. Tony will be to Rob's left with the 60, and Brandon will be the furthest south with the other 1000. I will need Brandon to be more aggressive than usual, checking into the dense forest and using the flank to make attacks. Brandon is a great defender, but I chose Rob for the middle because I trust him most with managing the line. The blocking team will be spread out, but close enough to see each other.
Considering this will be in a normal forest and considerin the distance between the dense forest and the reed pond, we can afford to be spaced out about 15m (50-60ft) from each other. I do not expect the enemy to have 4 players coming straight up the middle, so Rob's job will be to use the team to envelope and destroy the enemy quickly. Brandon can sneak through the thick forest and destroy the enemy from the shadows of the forest or mill ruins. Once the enemy attack has been ambushed and eliminated Rob will push the team forward into attack mode, and drive through the center, with Brandon pulling up the far south flank along the southern part of the looped path.
Dagger in your back
Me CPS 2000
I will be sprinting along the far north edge of the battlefield, above the reed pond, jumping over the creek, and attacking the enemy from the far north corner of the battlefield. The distance between the reed pond and the lake is not very wide (like 100 ft) and I feel confident being the only one going that way. If for some reason I get into a debacle (like 3 v 1) I can signal Rob to send whoever/however many people he wants to flank the enemy from behind (going up and around the pond) and sandwiching them between me and member(s) of the blocking team.
Once we push the enemy in, Rob can use safe areas like the collapsed house or the thick woods just below the enemy hill to position tony. Unfortunately Rob will have to be more out in the open, but his job is more floor general and the team is more effective this way.
I don't want to suicide rush the enemy all at once up the hill, so we will either starve them out and run them out of water (if they retreat back to the lake Brandon or I (or Rob, etc. if there is a switch) can sneak up and attack from behind. Or, we will fake a retreat with some of us falling back and others falling into the dense forest. When the enemy comes down the hill part of the team will trap them out in the open and other member(s) will rush for the flag, most likely myself, Rob, or Brandon.
The only vulnerability to this plan is if the enemy somehow sneaks south through the sandbar and gets by undetected. This would be very dangerous for them as Brandon could just hit them from the ridge/dense forest above if he hears/spots them.
If the plan goes wrong we will simply use the water/dense forest/obstacles etc. to block and then act like a swinging door (Getysburg anyone?) and hit them from behind at a right angle. I expect the boys to stick with Rob and Brandon, but we can mix things up if necessary.