"Having achieved such signal successes in the east, Russia and Roumania being both disposed of, the German leaders planned a campaign designed to crush Italy"

In the quoted passage by Kelly Miller, several historical dynamics throughout World War I are encapsulated. Miller presents a minute in the war when Germany, having accomplished significant success, turned its tactical focus in other places. Here's a breakdown and analysis of this passage:

** Signal Successes in the East: ** The expression refers to the accomplishments that Germany, along with its Central Powers allies, achieved on the Eastern Front of World War I. By the time of this narrative's focus, Germany had handled to protect decisive success over Russia. Following the Russian Revolution in 1917 and the subsequent Treaty of Brest-Litovsk in March 1918, Russia exited the war, enabling Germany to redirect its military efforts. Furthermore, the mention of Romania (here referred to in its historic context as 'Roumania') points to the Central Powers' reliable campaigns that subdued Romanian forces, further combining German impact and control in Eastern Europe.

** Russia and Roumania Being Both Disposed Of: ** "Disposed of" in this context implies that Germany and its allies had reduced the effects of the risk from these nations. The removal of Russia from the dispute freed up a considerable number of German soldiers and resources, which could be redeployed for other military objectives. Similarly, Romania's defeat after going into the war on the side of the Allies in 1916 and signing a peace treaty with the Central Powers in 1918 is another example of their neutralization.

** Campaign Designed to Crush Italy: ** After stabilizing the Eastern Front, Germany looked for to make use of vulnerabilities in other places. The Italian Front offered such a chance. Italy, having actually joined the Allies in 1915 against the Central Powers, ended up being the next target of German military ambitions. The expression "crush Italy" suggests not just defeat but a decisive and potentially disastrous campaign intended to get rid of Italy's capacity to contribute efficiently to the Allied war effort. This belonged to Germany's broader method to knock out key Allied countries and force a beneficial end to the war.

Overall, Miller's quote highlights an essential shift in German method during World War I, from concentrating on the Eastern Front to going for a knock-out blow versus Italy on the Southern Front, highlighting the fluid and dynamic nature of military technique and alliances during the war.