Can you change the voice of a paragraph from sentence to sentence?I have this: General Gage was ordered to deploy troops to Massachusetts. He acted...

The idea of switching between active and passive voice
within a paragraph is not only allowed in grammar, but in my
opinion, recommended.  I can see where you might be confused however, because of all the
lessons learned about not switching verb tenses within a paragraph
(or essay) and maintaining a uniform point-of-view.  Active and passive voice are not
under the same rules of uniformity as verbs and
point-of-view.

To put it simply, active
voice in a sentence makes the subject of the sentence commit the action.  In
a passive voice sentence, the subject is acted upon.  Within one
paragraph, a variety of passive and active sentences may very well still revolve around
the same topic.

Many experts suggest that when writing
argumentatively, sentences written in active voice tend to sound
stronger and more authoritative.  This is mostly true, in my opinion, and I very often
make suggestions for student writing to reflect this.  Active voice sentences can also
be kept much shorter, which drives a point home quicker.  However, an entire essay full
of sentences written only in the active voice, could very well come
across as simplistic, elementary, and lacking complexity of
thought.

Your example sounds great so far.  Keep
going!