>>96020484
>Olm-borne boarders are definitely something the British are not prepared for.
In general, I think Agarthan naval combat makes extensive use of mounted soldiers in pretty much the same way that infantry get deployed against unsupported tanks. Atlantean cataphracts are probably the best and most dangerous example, but something as simple as an Olm-Man with a hand-drill could be very dangerous for a navy used to the only threats coming from atop the waves.