Judy peaked around the ice-cap, she figured out the patterns that the guards/sentries walked at.  One guard would pass every five minutes.  So when they reached the side gate it had to be quickly.  The gate was guarded by two wolves, each with a gun, they were both looking ahead, in dead silence.

Judy figured that if she and Nick went in, three minutes before the next guard arrived, then they would be able to not be spotted, but then that begged the problem of getting past the actual gate.

Judy would start the howl, and while the wolves were distracted, Nick and Judy would be able to get in.

"You ready?" Nick called.

Judy nodded and sprang out, Nick following close behind.

They arrived at the gate.

"You ready to start the howl?" Nick looked down at his current partner in crime.

"Yep.." Judy gulped,"Get ready to run."

"If this doesn't work  Hopps.."Nick turned to her.

"I know, we will both be dead meat." Judy gulped again and took a deep breath.

"Aaaaaaaaaaaaaaahhhhhhhhhhhhhhhwwwwwwwwwwwwwwwwwooooooooooooooooo.." she shouted.

The wolves ears perked, and one by one, they each started to howl.

Nick and Judy ran past the sentries... they were in.