The Royal Marines piled into helicopters and boats and inserted into Estonian territory, hitting positions on the mainland and on an isolated island, doing their best to inflict maximum casualties on the Estonian Volunteer Defence Force during an exercise designed to see whether that countries tiny military can adequately defend itself against a top-tier foe.
And make no mistake about it, the Royal Marines are true commandos and are top-tier. But the local forces defending the island of Saaremaa included many members who had grown up on the island, and they fought the British to what referees called an Estonian victory. The Royal Marines called it a draw, according to an article in the British publication Plymouth Herald.
Also, in the Royal Marines' defense, the Estonians were backed up by British Apaches and likely would have lost their key position, and maybe the whole ball game, without that crucial air support.
The Marines successfully landed reconnaissance teams unseen, and those teams were able to operate for 24 hours undetected. Then, dummy raids on one side of the island drew off defenders before the Royal Marines launched their main assault on the opposite side, allowing them to reach their main objective with little contact.
So each side did well. The Royal Marines were able to hit their objective almost undetected, and the Estonians were able to defend it anyway, and that's good for both sides because, realistically, Estonia and Britain would more than likely fight on the same side in a war.
And the people Britain would liberate Saaremaa from would not be Estonian locals, they would be Russian commandos.
Under the surface of all European war games of the last few years sits the certainty that Russia's aggression in Ukraine only faded because it became too costly. If former Soviet Bloc countries who want to remain democratic and free are to do so, they have to be ready to fend off a Russian "grey-zone" attack at any time.
Grey Zone describes hostilities across cyberspace and physical terrain that fall just short of war. The successful Russian seizure of Crimea and the attacks into the Donbas region were both grey-zone operations.
Britain is obligated to help defend Estonia under both European Union and NATO agreements, and so it's good that their Royal Marines and Navy are getting more practice in the territory of the EU's more vulnerable members. The fact is that the Russian military, though a ghost of its former Soviet power, is still large enough to roll over the most vulnerable countries on its borders. The rapid deployment of other European and Western militaries would be necessary to beat Russia back.