This is a link to a site of Architectural images of ancient Rome. Advise students to download at least 3 different images and their short descriptions. Encourage them to view the images off-line for better time management. The site is huge and amusing. This selection features images and short descriptions of the various equipment and weapons related to a Roman soldier.
Teachers can divide the students to research either weapons or uniforms.
A look at the entire site may produce even more possibilities. This link will most likely be very popular with your class. Little instructions are given since the site is so versatile you should be able to come up with your own strategies. On-Line is only as good as your preparation. Always preview sites and links since they are subject to change anytime.