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| [Image] | Danish Scientist Hans Christian Oersted discovers the EM field | 1819 |
| [Image] | Electric telegraphy invented | 1827 |
| [Image] | First maritime use of radio telegraphy during the Crimean war | 1855 |
 | Heinrich Rudolf Hertz discovers the EM Wave | 1865 |
 | Guglielmo Marconi achieves radio communications over more than a mile | 1895 |
| [Image] | Marconi first recorded electronic impulses sent across the Atlantic by wireless means | 1898 |
| [Image] | First tactical use of wireless by naval shipping (USN) | 1903 |
| [Image] | Russo-Japanese war, the first use of radio to gain an advantage in war | 1904 |
| [Image] | Inadvertent communications jamming used during the Russo-Japanese war by Russian radio operator blanking Japanese communications | 1905 |
| [Image] | Deliberate ECM used between German cruisers Goeben, Breslau and HMS Gloucester | 1914 |
| [Image] | British interception and direction finding service established | 1915 |
| [Image] | British use DF against the German Fleet at the battle of Jutland | 1916 |
| [Image] | Fiirst British radar tested and first dedicated British shipborne ESM equipment (FH1) developed by the RN and Plessey | 1935 |
| [Image] | Radar in widespread use. Chaff invented by both the British and Germans. | 1938 |
| [Image] | First fitting of a naval radar onboard a ship by Germany (Graf Spee). ECM against radar used operationally by british against Germany. Bombers fitted with chaff and jammers. ECCM first used by Germany against British jamming | 1939 |
 | FH1 (HF/DF) fitted in HMS HESPERUS. Improved version, the FH3 fitted in HMS GURKHA and LANCE. FH3 successfully used to locate German U-Boat. German ESM (METOX) first fitted to BISMARK and PRINCE EUGEN | 1941 |
| [Image] | Naval ESM (FH3) widely fitted in up to 25 escort ships. | 1942 |
 | Personnel drawn from the existing telegraphist branch for EW direction finding duties in the third wireless office employing FH4 (1-24Mhz) HF/DF and SHF/DF equipment (UA3 7-11.5Ghz). Telegraphist ratings employed on EW were known as Telegraphist specialists TEL(S). See news item on Mr Harold Cooke Ex TEL(S). | 1942 - 1955 |
| | German submarines fitted with warner system against allied airborne radars.. First Air to Surface missile (FRITZ) attack by Germans against shipping in the Med. | 1943 |
 | Turning point in history for the EW branch when the first Radar detection systems (UA2 and UA3) widely fitted in RN warships. The implications of these systems originated todays modern doctrine and concepts. | 1955 - 1962 |
| | Introduction of the UA8/9/10/13/15 ESM suites and T667/668 and 669 shipborne jammers representing a significant investment and step change in the importance placed upon maritime EW. EW operators became Radio Operator (Warfare). Specialists in Signals Intelligence became Radio Operator (Specialist) | 1962 - 1975 |
| | First ship to ship missile launch prompting the fitting of chaff and jammer suites amoungst the worlds navies | 1967 |
 | First operational fit of UAA1. Saw the move of equipment from a dedicated EW Office to the operations room. | 1975 |
 | EW branch combined with the radar, sonar, missile and communications branches to form the operations branch. EW ratings adopted Radar branch badge to protect the existence of EW | 1975 |
| | EW training section moved from North Camp HMS MERCURY to ANSON Building HMS DRYAD. FEWSG formed in order to provide hostile EW training for fleet units. | 1977 |
| | Communications Technician (CT) branch formed from RO(S) branch. | 1978 |
 | EW gained new branch badge (elipse with electon flash) | 1979 |
| | EW played vital role in task force operations during Falklands conflict. Loss of 3 EW ratings KIA (now cemmemorated at the present EW school HMS Collingwood). Type 670 shipborne jammer introduced into service in HMS CHARYBDIS | 1982 |
| | EW School moved into new LEWIN building HMS Drayd. Anson building demolished. Type 675 jammer conducted sea trils in HMS HERMIONE | 1985 |
| | UAA1 ships were updated to UAA2 along with force defence jammer the Type 675 and Seagnat chaff system | 1987 |
| | ESM outfit UAF introduced into service in Type 23 frigates | 1989 |
| | As part of Op Granby, a detachment of FEWSG were supporting U.S 1st Armoured Division operating in Northern Saudi Arabia. From 3 Jan to 16 Mar this small detachment conducted an extremely successful deception plan against Iraqi forces enabling a passive relocation of the British Armoured Brigade. Their efforts were rewarded by a special citation from the US DoD. OC was WO1 Bob Lee. | 1991 |
 | Warfare branch formed from existing Ops and non technicians, seaman and WEM's. New branch badge issued (Weapon Engineering badge with letters EW under) | 1992 |
| | Outfit UAT1 entered service as replacement for UAF | 1993 |
| | EW training Unit moved to HMS Collingwood foolowing the handover of Dryad to the Joint military Police and administration school. | 2004 |
| | Warfare Specialist branch introduced. Ratings trained in generic warfare skills and then undertake training modules to qualify as EW specialists. Career path commences from AB. New branch badge issued | 2005 |
| | Fleet wide upgrade of all ESM systems to UAT MoD1 standard. | 2007 |
| | WO1 Phillip Lee retires from Naval service. The last RO(W) | 2008 |
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