Sentinel's Imperial-class Star Destroyer, the Core Envoy, and most of the flotilla's other capital ships were escorting supply convoys to Geonosis. The canon novel Tarkin (which takes place 5 years after the creation of the Galactic Empire) provides a hint in that it mentions the existence and use of Imperial-class Star Destroyers: In what year did the first Imperial-class Star Destroyer enter active service?
The Venator-class Star Destroyer was later phased out by the larger Imperial-class Star Destroyer:
When the Galactic Empire was created at the end of the Clone Wars, the Star Destroyer design in service at the time was the Venator-class:
