nationallibraryofireland

“Reported missing on April 6, 1915, he is the author of Letters from a Soldier, a work considered one of the great testimonies about this war.
"Our losses are dreadful; those of the enemy, even worse. You cannot know, my beloved mother, what man can do to man. For five days my shoes have been greasy with human brains, I have crushed chests, I have encountered entrails. The men eat what little they have snatched from the corpses. The regiment has been heroic; we have no officers left. All have died bravely. [...] Finally, after five days of horror that cost us twelve hundred victims, we have been withdrawn from this place of abomination."

Readable free at Gutenberg:

www.gutenberg.org

"A French painter and soldier, Eugène Lemercier was the grandson of Irish portrait painter Harriet Osborne O’Hagan. Aged fifteen, he began his training as a painter at the École des Beaux-Arts. In 1906, his studies were interrupted by a years' compulsory military service. A painter of some renown, Lemercier won several prizes for his work that includes ‘La Contemplation’. With the outbreak of war in August 1914, Lemercier was drafted in to the French Army. He is best known for the correspondence to his mother between August 1914 and his disappearance during the Battle of Les Éparges in April 1915."

His grandmother's DIB entry mentions a daughter, Marguerite Lemercier O'Hagan

O'Hagan, Harriet (née Osborne) www.dib.ie

Marguerite drew both her mother and son:

artvee.com

NB - North is at 4 o'clock. Going by the pattern of the roads, I think this is the area on GoogleMapsSatellite -
www.google.com

The brown area on the satellite is marked as bog on the map.

Bottom right(-ish) is "Clonbrock Desmene". Is that our old friends, the Dillons, and The Great Augusta ?

Here's a "Pin" placed where the 48 is in that triangular pink field on the right above. Note Google map is rotated such as North is facing SE as per map above.
maps.app.goo.gl

O Mac Your map is the right way up - how confusing !

beachcomber australia "Deep Undivided Bog"! And deffo our Augusta and Co.

Bridge St, NLS, sadly

The coronation of Edward VII and his wife, Alexandra, as king and queen of the United Kingdom and the British Dominions took place at Westminster Abbey, London, on 9 August 1902. Originally scheduled for 26 June of that year, the ceremony had been postponed at very short notice, because the King had been taken ill

The poster says 26 June, so it was put up before the cancellation, and would surely have been replaced before the event.

The dia says the PO was built 1895-97, but cryptically adds Fittings 1904 dia.ie

The other poster is for the Adder, a steamer sailing between Belfast and Ardrossan in Scotland.