Remember this post on Wednesday about the new Russian T-14 Armata tanks rolling down a Moscow street rehearsing for their annual Victory Day parade?

Yeah, well apparently they’re not all quite up to snuff.

One of them stalled and needed to be removed from practice Thursday, according to the Associated Press.

The war machine, which is said to be the most advanced of its kind in the world, features a remote-controlled cannon and unique protection for the soldiers operating it.

But, if it doesn’t move along because its engine doesn’t work — well — then how great is it, really?

More from the Associated Press:

Weaponry was rolling across central Moscow Thursday morning in the dress rehearsal of the May 9 military parade as Russia commemorates the 70th anniversary of victor of Nazi Germany in World War II.

 

One of the tanks moving on Red Square suddenly stopped while others drove on. The engine was still rumbling but it wouldn’t move. After an attempt to tow it failed, the T-14 rolled away under its own steam about 15 minutes later.