Roaming Defense

The reason I classify this as a “Pre-contact” defense strategy is mainly because it only works UNTIL you make contact. At that point you would envoke a different strategy. You might understand what I mean by this a little better if I would explain the strategy first.
This is definitely one of my favorite ways to start off a game. What I do is I pick a spot on the field just about as far forward as I can get while still being classified as “Defense”, and I’ll bunker down(this usually means pick a nice big tree and stick to it) for a couple of minutes, just to get myself enough time to work out my next move. Then I make a sequence of moves that sort of outline a defensive wall and could be looked at as a cop patrolling a beat. You could call it “Feeling out the opponent” but I like my terminology better.
What I do before each game is walk the field and get a thorough understanding of the layout and where the cover is. I set up an imaginery line that stretches accross the field connecting all of the cover. I stop at each point and think to myself what if I engage the enemy at this point? Where would I go? And I figure out my retreat routes. So before the game even starts I have my half of the field completely worked out.
When you DO engage the enemy you’ll want to implement a fighting retreat or something to that effect. This can actually be a really effective way to draw the oppositions attention and lure them into an ambush.
So to sum it up what you are doing is constantly moving from bunker to bunker or cover to cover until you make contact with the opposition.
This strategy usually works best when you have very few defenders(1 or 2) and a large playing field, because it helps to know where the attack is coming from before you can dig in and defend your base. One of the key advantages to this strategy is the distance at which you engage the opposition. If done correctly first contact will be made well away from your base and will give you pleanty of time/opportunities to wittle away at the attack force.
Some disadvantages to this strategy:

If you are not alert or the other team is quick you can become cut off from your path of retreat and surrounded. The point is to be quick and semi-stealthy so you don’t get caught hanging out in the wind.
When using this strategy the opposition can slip past you while you are on the other side of the field and take your base. THAT’S NOT A GOOD THING. So if you are the only defender make sure you don’t roam TOO far away from your base. You want to be able to cut off the attack squad wherever they come at your base. To do this you have to be VERY knowledgeable of your side of the field. You have to be able to work out angles and paths that the other team doesn’t even know about.
This strategy requires you to know your side of the field extremely well. You have to know it like the back of your hand.
I have used this strategy successfully many times against attack sqauds as big as 7 when I was the sole defender but I have also been horribly unsuccessful against attack squads as small as 2 when I was unfamiliar with the terrain.