Archaeologists believe the discovery of a 16th Century fort in Edinburgh is internationally significant.
The remains are linked to the Siege of Leith in 1560 when a joint force of Scots and English soldiers challenged a French force holding the port.
The artillery battery that has been uncovered in Pilrig Park is said to be the only one of its kind ever uncovered in Britain.
The team also discovered a blacksmith's forge and pottery.
City archaeologist John Lawson said: "We're extremely excited about the results of our investigations.
"The remains are of international importance in terms of our understanding of Renaissance warfare as they are a unique example of 16th Century artillery siege works in the UK."