Question: Ivo Werner is from Country A that invaded Country B because their military branch that helped the Old West police was unprepared. When was the word "Slavs" used in the national anthem of country B?

<P0-S0> In April 1969, Tito removed generals Ivan Gošnjak and Rade Hamović in the aftermath of the invasion of Czechoslovakia due to the unpreparedness of the Yugoslav army to respond to a similar invasion of Yugoslavia. <P0-S1> In 1968, Tito offered Czechoslovak leader Alexander Dubček to fly to Prague on three hours notice if Dubček needed help in facing down the Soviets. <SEP> <P1-S0> The word "Slavs" was used in the national anthem of the Slovak Republic (1939–1945), Yugoslavia (1943–1992) and the Federal Republic of Yugoslavia (1992–2003), later Serbia and Montenegro (2003–2006). <SEP> <P2-S0> Ivo Werner (born 19 August 1960) is a former professional tennis player originally from Czechoslovakia who competed for both his native country as well as West Germany. <P2-S1> Werner, who is now a tennis coach, immigrated to West Germany in 1982 and got citizenship two years later. <SEP> <P3-S0> ``in plenty and in time of need ''is the national anthem of the country of barbados. <P3-S1> it was written by irving burgie (1926 --) and was composed by c. van roland edwards (1912 -- 1985). <P3-S2> as one part of the west indies federation from 1958 -- 1962, barbados' anthem was supposed to be forged from the love of liberty (which is currently the national anthem of trinidad and tobago), however the current anthem was created with barbados' moves toward full independence. <P3-S3> this song was then adopted by barbados when it became independent in 1966. <SEP> <P4-S0> around the sixth century ad, a tribe of slavs arrived in a portion of central europe. <P4-S1> according to legend they were led by a hero named čech, from whom the word "czech" derives. <P4-S2> the ninth century brought the state of great moravia, whose first ruler (rastislav of moravia) invited byzantine ruler michael iii to send missionaries in an attempt to reduce the influence of east francia on religious and political life in his country. <P4-S3> these missionaries, constantine and methodius, helped to convert the czechs from traditional slavic paganism to christianity and established a church system. <P4-S4> they also brought the glagolitic alphabet to the west slavs, whose language was previously unwritten. <P4-S5> this language, later known as proto-czech, was beginning to separate from its fellow west slavic hatchlings proto-slovak, proto-polish and proto-sorbian. <P4-S6> among other features, proto-czech was marked by its ephemeral use of the voiced velar fricative consonant (/ɣ/) and consistent stress on the first syllable. <SEP> <P5-S0> In the American Old West, policing was often of very poor quality. <P5-S1> [citation needed] Public organizations were supplemented by private contractors, notably the Pinkerton National Detective Agency, which was hired by individuals, businessmen, local governments and the federal government. <P5-S2> At its height, the Pinkerton Agency's numbers exceeded those of the United States Army. <P5-S3> [citation needed] The Army often provided some policing alongside poorly resourced sheriffs and temporarily organized posses. <P5-S4> [citation needed]