Flag of the Republica Federal de Centro America (1825-1838) captured in Nicaragua in the action at Serapaqui in 1848 by Captain Granville Gower Loch (1813-53), HMS 'Alarm'.

The fly half of a cotton flag is dyed unevenly a pale blue, with a horizontal white stripe across the centre. Painted on the centre stripe in black, is a triangle containing a row of volcanoes with a cap of liberty above; the sea is depicted below the triangle.

The legend surrounding the arms reads: 'REPVB[LICA FEDERAL DEL CE]NTRO AMERICA'. Traces of a second badge can be seen sketched on the white stripe. White cord has been hand sewn into the torn edge of the flag.

A small naval expedition was called in by the British Consul-General at Bluefields to protect British interests in Nicaragua. HMS 'Alarm' commanded by Granville Gower Loch, and HMS 'Vixen' commanded by Alfred Phillips Ryders were despatched by the commander on the South American station - Charles John Austin. They attacked a fort at Serapaqui, thirty miles up river, held by Colonel Salas of the Nicaraguan army. The enemy's colours were taken by Denis Burke, stoker of the 'Vixen'. The fort was captured and burnt and the Nicaraguans fled. The British then withdrew to their ships. The British demands were conceded and a satisfactory treaty was arranged.