Since that looks like Isandlwana in the background, I guess the ancestors of Hanna-Justina Marseille's helper Matilda are coming to wipe out the ancestors of all these British characters!
♫ Rule Britannia! Britannia rule the waves Britons never, never, never shall be slaves. Rule Britannia! Britannia rule the waves. Britons never, never, never shall be slaves. ♫
The "All Hail Britannia" does warrant an 'code_geass' tag, ain't it?
"Britannia" is the name for Roman Britain. Insulae Britannicea consisted of the islands of Albion (England), Hibernia (Ireland), Thule (Iceland) and several smaller islands. Over time, Albion gained the title 'Britannia' and the group was dropped, leaving Britannia to refer to the entirety of the British Isles. During the time of the British Empire, 'Britannia' became a personification for the Empire, like Colombia for the United States and Marianne for France.
Since the image is depicting Imperial British soldiers, I would suggest the Code Geass tag be non-applicable.
"Britannia" is the name for Roman Britain. Insulae Britannicea consisted of the islands of Albion (England), Hibernia (Ireland), Thule (Iceland) and several smaller islands. Over time, Albion gained the title 'Britannia' and the group was dropped, leaving Britannia to refer to the entirety of the British Isles. During the time of the British Empire, 'Britannia' became a personification for the Empire, like Colombia for the United States and Marianne for France.
Since the image is depicting Imperial British soldiers, I would suggest the Code Geass tag be non-applicable.
On a related note, Saber's inclusion here is rather ironic considering modern "native" British people are descended from the Saxons, who King Artorius/Arthur (whether in myth or actual history) fought against. That's like some ancient Canaanite folk hero joining the Mossad.
An updated version of this could also feature British characters from Girls und Panzer, Kantai Collection, Girls Frontline, Azur Lane, Warship Girls and Princess Principal.