The answer would be: Sixth
The first Amendment is:
First: Freedom of speech, religion, or press
Second: The right to bare arms
Third: Housing of soldiers
Fourth: No unreasonable searches (meaning warrant an such)
Fifth: Protection of rights life, liberty, and the pursuit of happiness
Sixth: Right to trial in criminal cases
Seventh: Rights in civil cases
Eighth: No excessive punishments
Ninth: Other rights
Tenth: Undelegated power kept by the states and people
Hope this helps! :)