in paragraph 1 of this section, it says that Vietnam’s emperor was “wary that the Frenchman’s religion was just the calling card for an invasive force.”
Based on context clues, what do you think wary means?
You can tell by "invasive force". It means engaging in, or given to armed aggression. Another way to tell what wary means by taking the word "worry" and "wary". They are very similar.