De or het tankdivisie?

The correct Dutch article is:

de tankdivisie

Rule Words ending in -tie and -sie: almost always de. See the rule

How to use tankdivisie

the tankdivisiede tankdivisie
this tankdivisiedeze tankdivisie
that tankdivisiedie tankdivisie
our tankdivisieonze tankdivisie
your tankdivisiejouw tankdivisie
every tankdivisieelke tankdivisie
which tankdivisie?welke tankdivisie?
a big tankdivisie / the big tankdivisieeen grote tankdivisie, de grote tankdivisie