Testing stepper motors (no replies)

I am currently in the middle of building my own design delta printer - closer to a Kossel than to a Rostock. I don't yet have the electronics - I'm not sure which direction I'm going - but I wanted to test the stepper motors I recently installed.

I have an adafruit motorshield for my arduino uno, so I connected the motor to it, connected a 12 volt power supply to the motor power supply, removed the jumper from the board, and proceeded to load and try the sample sketch that adafruit provides. I got SOME movement from the motors, but before anything substantial could happen, there was a big puff of smoke from the motor shield. I quickly disconnected everything.

I'm wondering 1) what I could have done wrong, and 2) did I damage my motor. According to the Lulzbot web site, the motor is rated at 2.8 volts. I'm not sure what the adafruit board puts out, but I was supplying 12 volts to it. I though I heard of people running their steppers at up to 24 volts, so I thought I'd be safe.

I guess it's possible that I hooked the motor up wrong. An on-line spec sheet indicated that green/black was one coil and red/blue was the other. I hooked them up in the order black, green, nc, blue, red as I was looking at the adafruit board.

Any assistance would be greatly appreciated.