Peter Lacy, Irish-born soldier who later serves in the Imperial Russian Army, is born Pierce Edmond de Lacy into a noble Irish family on September 26, 1678, in Killeedy near Limerick, County Limerick. Considered one of the most successful Russian Imperial commanders before Pyotr Rumyantsev and Alexander Suvorov, in a military career that spans half a century, he claims to have participated in 31 campaigns, 18 battles, and 18 sieges.

At the age of 13, during the Williamite War in Ireland, Lacy is attached to the Jacobite defence of Limerick against the Williamites with the rank of Lieutenant. The Flight of the Wild Geese follows, with him, his father and his brother joining the Irish Brigade in France. After his relatives lose their lives fighting for Louis XIV in Italy, he is induced to seek his fortune elsewhere. After two years of service in the Austrian army, he follows his commander, Charles Eugène de Croÿ, into the Russian service.

Lacy’s first taste of land battle in Russia is the disastrous defeat at Narva, in which he commands a unit of musketeers, holding the rank of poruchik. During the Great Northern War he is seriously wounded on two occasions, also gaining the rank of colonel in 1706. In the same year, Peter the Great gives him command of the Polotskii regiment and three new regiments raising him to colonel status. The following year he leads his brigade at Poltava and in the ensuing battle he greatly distinguishes himself. In the 1708 battle of Rumna, he attacks and captures the headquarters of Charles XII of Sweden. He gains fame at this stage by advising the Czar that musketeers should wait until they were within a few yards of the enemy before opening fire. Prior to this, the Russians were known for uncoordinated fire. From this point begins his fame as a soldier. His next active service, still under Prince Anikita Repnin, is the siege of Riga. He is reputedly the first Russian officer to enter the capital of Livland and he is appointed the first Russian chatelain of Riga Castle in the aftermath.

In 1719, Major General Fyodor Apraksin‘s fleet lands Lacy with 5,000 infantry and 370 cavalry near Umeå in Sweden, where they proceed to devastate a dozen iron foundries and a number of mills. Two years later he leads a similar action against Sundsvall. Soon promoted to General, he enters the Military Collegium, as the Russian Ministry of Defense was then known, in 1723. Three years later, he succeeds Repnin in command of the Russian forces quartered in Livland, and in 1729 he is appointed Governor of Riga. These positions bring him in contact with the Duchess of Courland, who before long ascends the Russian throne as Empress Anna. During her reign, Lacy’s capacity for supreme command is never doubted.

Lacy is one of the first recipients of the Order of Saint Alexander Nevsky when it is established, furthermore, he is given command of all infantries in Saint Petersburg, Ingria and Novgorod. By 1728 he is ranked third of only six full generals in the Russian Army and the only foreigner. As a foreigner, his salary is 3,600 Roubles a year, 15% higher than Russian generals. Higher salaries for foreign-born generals are seen in other ranks too. His signature, even on documents in Cyrillic script, always appear in English and Latin script which suggests he never gains proficiency in the Russian language.

When Catherine is Empress, Lacy is given responsibility for removing Maurice de Saxe from Courland. Saxe had managed to gain support and was even mentioned as marrying Anna, Duchess of Courland.

Having saved her from marriage to Saxe, Anna is very familiar with Lacy, and he becomes one of her most trusted generals. The War of the Polish Succession again calls him into the field. In 1733, he and Burkhard Christoph von Münnich expel the Polish king, Stanisław I, from Warsaw to Danzig, which is besieged by them in 1734. Thereupon the Irishman is commanded to march toward the Rhine and join his 13,500-strong contingent with the forces of Eugene of Savoy. To that end, his corps advances into Germany and, meeting the Austrians on August 16, returns to winter quarters in Moravia with exemplary discipline. In 1734, he commands Russian forces at the Siege of Danzig in which French and Polish forces are defeated. Lacy leads the Russians in two other decisive battles of the conflict, Wisiczin and Busawitza. In the latter battle, he is outnumbered ten to one but nevertheless prevails. For this victory, he is awarded Order of the White Eagle. After Busawitza Lacy is ordered to reinforce the Austrians at Mannheim. however, when he reaches Mannheim peace has been declared. He is received by Emperor Charles and Viennese society. On his return from Vienna, he is met by a courier from Saint Petersburg who delivers to him his patent honouring him as Field Marshal.

With the patent of Field Marshal is the news that Russia is at war with Turkey and Lacy is ordered at once to capture Azov Fortress. This he does despite being wounded in the fray. His rival, Burkhard Christoph von Münnich, had been campaigning in the Crimea with little success. Thus, after taking Azov, Lacy is ordered to capture Crimea. He bridges the Sea of Azov at a narrow point near Perekop. Within four days, aided by favourable winds and tides, his entire army crosses it and begins marching on Arabat. The Russians meet the Khan’s much larger Crimean army and rout them in two battles, on June 12 and 14. In 1738, his corps again land in Crimea and take the fortress of Chufut-Kale near the Khan’s capital, Bakhchisaray. For his success in Poland and Crimea he is awarded the Order of St. Andrew.

As soon as peace has been restored, Lacy is reinstated as the Governor of Livland, while Emperor Charles VI confers on him the title of an imperial count. His indifference to politics prevents his downfall following Anna’s death, when other foreign commanders, most notably von Münnich, fall into disgrace and are expelled from active service.

In December 1741, Elizabeth seizes power. Lacy is roused from bed in the early hours of the morning in a test of his loyalty. He is not aware if the men sent to him are from Elizabeth or Grand Duchess Anna. He is asked what party he is of, Anne or Elizabeth, and he answers, “Of the party of the reigning Empress.” A period of unrest follows, and he is called upon to restore order. Most of what is known as the German Faction falls out of favour at this stage. The restoration of order in Saint Petersburg is largely down to the prompt actions of Lacy.

When the Russo-Swedish War breaks out in 1741, the government of Anna Leopoldovna appoints Lacy Commander-in-Chief as the most experienced among Russian generals. He quickly strikes against Finland and wins his last brilliant victory at Lappeenranta in August 1741. His force, however, is poorly supplied and he is forced to withdraw to Saint Petersburg. The following year he rallies his forces and proceeds to capture Hamina, Porvoo and Hämeenlinna, by August encircling more than 17,000 Swedes near Helsinki and effectively bringing the hostilities to an end.

The war over, Lacy withdraws to Riga and resumes the command of the Russian forces stationed in Livland. He administers what is now northern Latvia and southern Estonia until his death on his private estate in Riga on April 30, 1751. His son, Franz Moritz von Lacy, enters the Austrian service in 1743 and becomes one of the most successful imperial commanders of the 18th century and also a Count of the Holy Roman Empire. His nephew, George Browne, is also a general in the Russian army.