De or het linieregiment?

The correct Dutch article is:

het linieregiment

Rule Words ending in -ment: usually het. See the rule

How to use linieregiment

the linieregimenthet linieregiment
this linieregimentdit linieregiment
that linieregimentdat linieregiment
our linieregimentons linieregiment
your linieregimentjouw linieregiment
every linieregimentelk linieregiment
which linieregiment?welk linieregiment?
a big linieregiment / the big linieregimenteen groot linieregiment, het grote linieregiment