Originally Posted by Wildman

1803–1815 Napoleonic Wars
1804–1813 First Serbian Uprising
1804–1813 Russo-Persian War
1808–1809 Finnish War
1809 Polish–Austrian War
1815–1817 Second Serbian Uprising
1817–1864 Russian conquest of the Caucasus
1821–1832 Greek War of Independence
1821 Wallachian uprising
1823 French invasion of Spain
1826–1828 Russo-Persian War
1827 War of the Malcontents
1828–1829 Russo-Turkish War
1828–1834 Liberal Wars
1830 Ten Days' Campaign (following the Belgian Revolution)
1830–1831 November Uprising
1831 Canut revolts
1831–1832 Bosnian Uprising
1831–1836 Tithe War
1832 War in the Vendée and Chouannerie of 1832
1832 June Rebellion
1833–1839 First Carlist War
1833–1839 Albanian Revolts of 1833–39
1843–1844 Albanian Revolt of 1843–44
1846 Galician slaughter
1846–1849 Second Carlist War
1847 Albanian Revolt of 1847
1847 Sonderbund War
1848–1849 Hungarian Revolution and War of Independence
1848–1851 First Schleswig War
1848–1849 First Italian War of Independence
1853–1856 Crimean War
1854 Epirus Revolt of 1854
1858 Mahtra War
1859 Second Italian War of Independence
1861–62 Montenegrin–Ottoman War (1861–62)
1863–1864 January Uprising
1864 Second Schleswig War
1866 Austro-Prussian War
1866–1869 Cretan Revolt
1866 Third Italian War of Independence
1867 Fenian Rising
1870–1871 Franco-Prussian War
1872–1876 Third Carlist War
1873–1874 Cantonal Revolution
1875–77 Herzegovina Uprising (1875–77)
1876–78 Serbian–Ottoman War (1876–78)
1876–78 Montenegrin–Ottoman War (1876–78)
1877–1878 Russo-Turkish War
1878 Epirus Revolt of 1878
1885 Serbo-Bulgarian War
1897 Greco–Turkish War

Head scratch.

None of the wars you quoted involved EU member states at the time of the war. What point am I missing?

Edit: ... he said politely.