Hmmmmmmmmmmmmm how did all those fires start then

Fires where? In the middle of a built up area of a city in 1916 in the following buildings the Irish Times warehouse and Hoyte's Druggists and Oil Works. All of which contain highly flammable material, tell me Raggy were there any gas mains in this part of Dublin? Any coal fires? any coal fired boilers? I can think of many sources of ignition even if you cannot. But no none of these could possibly have started a fire it must have been "The Brits" using incendiary shells - utterly risible. Tell me Raggy what would an anti-submarine Patrol Boat be doing with incendiary shells? For what possible reason would she carry them or fire them? The Helga would have carried and fired AP or HE rounds. Oh another source of ignition Raggy is transfer of Kinetic Energy (Example: A Battle Class Destroyer was used as a target for an inert deadweight Sea Dart Missile, the ship was closed down as she would have been had she been at action stations with cameras and sensors placed in every compartment of the ship. This dead weight missile hit the main deck just below the bridge the fuel of course did start fires in easily identifiable locations, the transfer of kinetic energy however lifted the Operations Room deck to within 3 feet of the deckhead and it started fires throughout the ship). Solid AP shot would have the same effect and High Explosive rounds would start fires too.

Now then tell us all about these incendiary shells Raggy? What guns fired them and what were they used for? Absolutely no naval application and no Army application either for the conditions and circumstances that prevailed on the Western Front (All that mud and rain - just WTF are you going to set alight?) You mentioned Thermite which first appears to have been used in the Second World War NOT during the First World War.