For protection, a battering ram was suspended in a mobile shelter called a tortoise, or testudo.
From the en.wikipedia.org
The testudo formation that Gregory's army had adopted moved slowly but also had a good defense.
From the en.wikipedia.org
The opening battle scene with the testudo was laughable.
From the guardian.co.uk
They used their shields to cover their own and their horses'backs, forming a type of mobile testudo.
From the en.wikipedia.org
From the far side of the Grand Canal they looked like a testudo, the ancient Roman military formation for storming a gateway under a shelter of shields.
From the telegraph.co.uk
Meanwhile, other cohorts approached the city's wall in testudo formation, bringing up battering rams and ladders to breach the gates and scale the walls.
From the en.wikipedia.org
There's a particularly fine battle scene in which Marcus and his men form a testudo to confront the ferocious Brits, that concludes with him receiving near fatal wounds.
From the guardian.co.uk
The first battle scene was good, I cannot comment as to the technical veracity of the testudo, but it made an interesting change from otherwise bog-standard limb-hacking and blood-letting.
From the guardian.co.uk
Testudo was later filled with 700 pounds of cement and fastened to his pedestal to prevent future removals, but students at rival schools continued to vandalize it.
From the en.wikipedia.org
More examples
A movable protective covering that provided protection from above; used by Roman troops when approaching the walls of a besieged fortification
Type genus of the Testudinidae
Testudo is a genus of tortoises found in North Africa, western Asia, and Europe. Several species are under threat in the wild, mainly from habitat destruction.
The University of Maryland, College Park (often referred to as The University of Maryland, UM, UMD, UMCP, or Maryland) is a public research university located in the city of College Park in Prince George's County, Maryland, just outside Washington, D.C. ...