Mark Harris

'Harwich Submarines' tells the story of how a small force of British submariners shaped and eventually dominated the battle space in the North Sea in 1914. In the words of the enemy commander, they brought 'constant danger ... to this confined area.'
#royalnavy #ww1 #navalhistory #submarineservice

My first book, Harwich Submarines in the Great War, features. Their impact in 1914 caused the German fleet commander to write that: 'In favourable weather conditions the German Fleet will be literally blockaded in our estuaries by enemy submarines ...'
#royalnavy #ww1 #navalhistory #submarineservice

Solving a mystery – consulting a piece of code breaking history at the National Archives Signal flags and pendants from the Signalbuch der Kaiserliche Marine, captured from S.M.S. Magdeburg, held at The National Archives, author’s image I was at the National Archives recently, re…

A short piece on researching naval code breaking. I was able to solve a mystery by consulting a historic code book held at the National Archives...

markharrisauthor.wordpress.com/2026/01/26/s...

#navalhistory #germannavy #russiannavy #royalnavy #WW1 #writinghistory #historicalresearch

The First World War in the Baltic Sea By Mark Harris The captain of Bayan was just finishing his lunch: … I was already leaving to go up to the bridge, when suddenly I heard the signalman cry out, ‘Pallada exploded!’ I was on the bridg…

Helion have just published a short blog post that I wrote about my new book. Click through to read:

helionbooks.wordpress.com/2026/01/02/t...

#navalhistory #germannavy #russiannavy #royalnavy #WW1

It me! (and friend)

Congratulations Jane!

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The First World War in the Baltic Sea, Volume 1 Essen’s triumph, 1914 to February 1915 Published by Helion & Company, October 2025 A definitive history of the remarkable Baltic naval campaign, revealed through new research in Russian, German…

My latest book, The First World War in the Baltic Sea, Volume 1, was recently published. The first comprehensive account of the campaign in English.
markharrisauthor.wordpress.com/the-first-wo...

#navalhistory #germannavy #russiannavy #royalnavy #WW1 #balticsea #published #historybooks #history

The story of how Heligoland was a British outpost in the North Sea until 1890.

The crew of Lady Ismay remembered Lady Ismay working before the war (courtesy of Old Ship Picture Galleries) On the 11th hour of the 11th day of the 11th month, remember the crew of Lady Ismay. Many vessels were requisitioned for n…

On the 11th hour of the 11th day of the 11th month, remember the crew of Lady Ismay. Click through for a 2 minute read about them:
markharrisauthor.wordpress.com/2025/11/11/t...

#navalhistory #history #Remembrance #royalnavy #ww1

Latest article:

Royal Navy remembrance. In focus: HMS Turbulent lost in 1943

www.navylookout.com/royal-navy-r...

#Remembrance #Wewillrememberthem

My article on the loss of S.M.S. Yorck was just published in Topmasts, the free on-line magazine of The Society for Nautical Research:
snr.org.uk/topmasts.../...
Picture of Yorck courtesy of Naval History and Heritage Command
#germannavy #navalhistory #WW1