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Nobody, and I mean NOBODY, does Electronic and Information Warfare like the United States. An interesting trivial question, when & where was the first recorded use of Electronic Warfare and by which country?

Lonepalm would you count the purposeful
telegraphing/messaging to London of the false outcome of waterloo
by the bankers who then bought up all the falling prices before the real news came through?

Surely that counts as market manipulation, not EW.

For EW any subversion of military adversaries would count, and there may be a more nuanced historical event, so what's the real answer?

Wanting to know the history, I cheated and used AI for a guess.

Electronic Warfare History
Question	Answer
First Recorded Use	Date: 15 April 1904 Place: Battle of Port Arthur (Lüshunkou, China) Country: Russia Action: Shore stations under Capt. Yevgeny Pokorny jammed Japanese naval radio fire-control.
Top 10 Public EW Successes (by strategic effect)
Rank	Operation / Event	Key Outcome
1	Operation Desert Storm 1991 – Gulf War	Coalition EW blinded Iraqi IADS; 100,000+ sorties, <50 aircraft lost; Kuwait liberated in 100 hours.
2	Mole Cricket 19 1982 – Bekaa Valley	Israel destroyed 29 SAM sites & 86 Syrian jets using jamming + decoys; zero IAF losses.
3	Operation Window 1943 – RAF over Hamburg	Chaff cut bomber losses 75%; enabled firestorm raids that crippled German industry.
4	Battle of the Beams 1940-41 – UK vs Luftwaffe	UK jammed German Knickebein beams; saved cities, preserved RAF strength.
5	Wild Weasel 1965-73 – Vietnam	US SAM-hunting jets neutralized 200+ sites; air losses fell from 10% to <2%.
6	D-Day Deception 1944 – Ops Taxable/Glimmer	Radar ghosts fooled Germans; Panzer divisions sent to wrong beaches.
7	Battle of Latakia 1973 – Yom Kippur War	Israeli boats used chaff/EW; sank 5 Syrian missile boats, no losses.
8	El Dorado Canyon 1986 – Libya Raid	US jammed Libyan SAM radars; zero aircraft lost in punitive strikes.
9	Russian EW in Syria 2015-present	Krasukha-4 blinded rebel drones & NATO sensors; kept Assad in power.
10	Donbas Hybrid War 2014-2022	Russian Borisoglebsk-2 jammed Ukrainian artillery & drones; froze front lines.

[LonePalm]

Your AI search is mostly correct.

More specifically, a Russian radio telegrapher heard the Japanese using the frequency he was on. He then made use of his shore stations superior broadcast power to jam the Japanese communications by holding down his telegraph key.

SpyNavy

Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)