A TOP SECRET dossier that reveals Hitler’s plans to invade Ireland during the Second World War will go up for auction tomorrow afternoon.

It contains maps and postcards of Ireland that shed more light on Operation Green, Nazi Germany’s plan to overthrow the Irish state and form one of six regional administrative centres for Britain and Ireland in Dublin.

“This is the very first set of invasion plans I’ve ever seen to do with Ireland” Richard Westwood-Brookes of Mullocks Auctioneers in Ludlow, Shropshire, told TheJournal.ie. “I honestly don’t know how they came into the hands of the collector, but similar UK plans usually fall into the hands of relatives of soldiers who discovered abandoned front line posts in Northern France.”

Many of the documents are simply postcards, which German diplomats collected for use in the invasion handbook. Similarly, German Ambassador to Britain Joachim von Ribbentrop took snapshots and bought postcards in Cornwall in the 1930s in preparation for an invasion of Britain.

Ireland was neutral during the war. However, Westwood-Brookes says that the documents further support the case that the Nazi leader would not have respected it.

“It’s a rather creepy feeling that Ireland’s neutrality would be ignored. But then, that’s Hitler for you.”

In 1940, Hitler abandoned immediate plans to invade Ireland after the Luftwaffe failed to gain air supremacy during the Battle of Britain.

The auction starts at 1pm, and the documents have a guide price of £400-£600.

Felsen und ruinen von Cashel (Richard Westwood-Brookes)

Clogher-tal-kleinbahn in der haupstrasse (Richard Westwood-Brookes)

Schaftmarkt in Killarney (Richard Westwood-Brookes)

Strasse vom Trunk-Road-Typus im Dorf Palmerstown, Dublin (Richard Westwood-Brookes)