function fort(side, height) {
  var turret, i, torch;

  if (typeof side == 'undefined') {
    side = 18;
  }
  if (typeof height == 'undefined') {
    height = 6;
  }
  // make sure side is even
  if (side % 2) {
    side++;
  }
  var battlementWidth = 3;
  if (side <= 12) {
    battlementWidth = 2;
  }
  if (height < 4 || side < 10) {
    throw new java.lang.RuntimeException(
      'Forts must be at least 10 wide X 4 tall'
    );
  }
  //
  // build walls.
  //
  this.chkpt('fort')
    .down()
    .chessboard(blocks.wool.black, blocks.wool.white, side)
    .up()
    .box0(blocks.brick.stone, side, height - 1, side)
    .up(height - 1);
  //
  // build battlements
  //
  for (i = 0; i <= 3; i++) {
    turret = [
      blocks.stairs.stone,
      blocks.stairs.stone + ':' + Drone.PLAYER_STAIRS_FACING[(this.dir + 2) % 4]
    ];
    this.box(blocks.brick.stone) // solid brick corners
      .up()
      .box(blocks.torch)
      .down() // light a torch on each corner
      .fwd()
      .boxa(turret, 1, 1, side - 2)
      .fwd(side - 2)
      .turn();
  }
  //
  // build battlement's floor
  //
  this.move('fort')
    .up(height - 2)
    .fwd()
    .right();

  for (i = 0; i < battlementWidth; i++) {
    var bside = side - (2 + i * 2);
    this.box0(blocks.slab.oak, bside, 1, bside)
      .fwd()
      .right();
  }
  //
  // add door
  //
  torch = blocks.torch + ':' + Drone.PLAYER_TORCH_FACING[this.dir];
  this.move('fort')
    .right(side / 2 - 1)
    .door2() // double doors
    .back()
    .left()
    .up()
    .box(torch) // left torch
    .right(3)
    .box(torch); // right torch
  //
  // add ladder up to battlements
  //
  this.move('fort')
    .right(side / 2 - 3)
    .fwd() // move inside fort
    .turn(2)
    .box(blocks.air, 1, height - 1, 1)
    .ladder(height - 1)
    .move('fort');
}
*********************************************************************
### Drone.fort() method

Constructs a medieval fort.

#### Parameters
side - How many blocks whide and long the fort will be (default: 18 . Must be greater than 9)
height - How tall the fort will be (default: 6 . Must be greater than 3)

#### Example

At the in-game prompt you can create a fort by looking at a block and typing:

```javascript
/js fort()
```

Alternatively you can create a new Drone object from a Player or Location object and call the fort() method.

```javascript
var d = new Drone(player);
d.fort();
```
![fort example](img/fortex1.png)
*