Throughout history we see stories of civilisations discovering and invading new territories that would’ve been completely new to them. During these times a common theme is having allies within these new territories giving them vital information on tribes, land lay outs, religious customs and so on.
While they may have had native translators to help. How quickly were these translators able to learn new languages that could’ve possibly never heard before until needed?
Did any invasions ever halt or slow down while these languages were being learned ?
I wrote about this common question type over here on this subreddit.